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+--------+-------------------------+-------------------------+--------+--------+
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|00000020| 74 6f 70 68 65 72 20 44 | 2e 20 4f 72 72 29 0a 4e |topher D|. Orr).N|
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|00000040| 73 64 6f 73 2e 70 72 6f | 67 72 61 6d 6d 65 72 2c |sdos.pro|grammer,|
|00000050| 61 6c 74 2e 73 6f 75 72 | 63 65 73 0a 53 75 62 6a |alt.sour|ces.Subj|
|00000060| 65 63 74 3a 20 4e 50 52 | 49 4e 54 3a 20 20 61 20 |ect: NPR|INT:  a |
|00000070| 54 53 52 20 74 6f 20 73 | 75 62 6d 69 74 20 61 20 |TSR to s|ubmit a |
|00000080| 66 69 6c 65 20 74 6f 20 | 44 4f 53 27 73 20 50 52 |file to |DOS's PR|
|00000090| 49 4e 54 2e 43 4f 4d 0a | 4d 65 73 73 61 67 65 2d |INT.COM.|Message-|
|000000a0| 49 44 3a 20 3c 31 39 39 | 30 4d 61 72 31 36 2e 32 |ID: <199|0Mar16.2|
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|000000c0| 68 69 2e 69 6c 2e 75 73 | 3e 0a 44 61 74 65 3a 20 |hi.il.us|>.Date: |
|000000d0| 31 36 20 4d 61 72 20 39 | 30 20 32 30 3a 31 34 3a |16 Mar 9|0 20:14:|
|000000e0| 33 37 20 47 4d 54 0a 0a | 49 20 68 61 76 65 20 77 |37 GMT..|I have w|
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|00000100| 41 73 73 65 6d 62 6c 79 | 20 74 68 61 74 20 69 73 |Assembly| that is|
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|00000d50| 75 73 68 20 74 68 65 20 | 66 6c 61 67 73 0a 09 63 |ush the |flags..c|
|00000d60| 6c 69 09 09 09 09 3b 20 | 44 69 73 61 62 6c 65 20 |li....; |Disable |
|00000d70| 69 6e 74 65 72 72 75 70 | 74 73 0a 09 70 75 73 68 |interrup|ts..push|
|00000d80| 09 63 73 09 09 09 3b 20 | 50 75 73 68 20 74 68 65 |.cs...; |Push the|
|00000d90| 20 43 53 20 72 65 67 69 | 73 74 65 72 0a 09 6d 6f | CS regi|ster..mo|
|00000da0| 76 09 64 69 2c 6f 66 66 | 73 65 74 20 63 73 3a 69 |v.di,off|set cs:i|
|00000db0| 6e 74 5f 72 65 74 75 72 | 6e 09 3b 20 57 68 65 6e |nt_retur|n.; When|
|00000dc0| 20 77 65 20 72 65 74 75 | 72 6e 2c 20 77 65 20 77 | we retu|rn, we w|
|00000dd0| 61 6e 74 20 74 6f 20 65 | 78 69 74 0a 09 70 75 73 |ant to e|xit..pus|
|00000de0| 68 09 64 69 0a 09 6a 6d | 70 09 64 77 6f 72 64 20 |h.di..jm|p.dword |
|00000df0| 70 74 72 20 63 73 3a 6f | 6c 64 5f 69 6e 74 5f 32 |ptr cs:o|ld_int_2|
|00000e00| 38 09 3b 20 54 72 61 6e | 73 66 65 72 20 63 6f 6e |8.; Tran|sfer con|
|00000e10| 74 72 6f 6c 20 74 6f 20 | 6f 6c 64 20 69 6e 74 20 |trol to |old int |
|00000e20| 32 38 68 0a 0a 69 6e 74 | 35 3a 0a 09 70 75 73 68 |28h..int|5:..push|
|00000e30| 09 62 78 0a 09 70 75 73 | 68 09 65 73 0a 09 6d 6f |.bx..pus|h.es..mo|
|00000e40| 76 09 62 78 2c 77 6f 72 | 64 20 70 74 72 20 43 72 |v.bx,wor|d ptr Cr|
|00000e50| 69 74 53 65 63 74 46 6c | 61 67 5b 30 5d 09 3b 20 |itSectFl|ag[0].; |
|00000e60| 4c 6f 6f 6b 20 61 74 20 | 74 68 65 20 43 72 69 74 |Look at |the Crit|
|00000e70| 2e 20 53 65 63 2e 20 46 | 6c 61 67 0a 09 6d 6f 76 |. Sec. F|lag..mov|
|00000e80| 09 65 73 2c 77 6f 72 64 | 20 70 74 72 20 43 72 69 |.es,word| ptr Cri|
|00000e90| 74 53 65 63 74 46 6c 61 | 67 5b 32 5d 0a 09 63 6d |tSectFla|g[2]..cm|
|00000ea0| 70 09 62 79 74 65 20 70 | 74 72 20 65 73 3a 5b 62 |p.byte p|tr es:[b|
|00000eb0| 78 5d 2c 30 68 09 09 3b | 20 49 66 20 6e 6f 6e 2d |x],0h..;| If non-|
|00000ec0| 7a 65 72 6f 2c 20 44 4f | 53 20 69 73 20 62 75 73 |zero, DO|S is bus|
|00000ed0| 79 0a 09 6a 65 09 6f 6b | 32 72 75 6e 09 09 09 09 |y..je.ok|2run....|
|00000ee0| 3b 20 5a 65 72 6f 2c 20 | 73 6f 20 69 6e 76 6f 6b |; Zero, |so invok|
|00000ef0| 65 20 4e 50 52 49 4e 54 | 0a 09 70 6f 70 09 65 73 |e NPRINT|..pop.es|
|00000f00| 0a 09 70 6f 70 09 62 78 | 0a 09 6d 6f 76 09 63 73 |..pop.bx|..mov.cs|
|00000f10| 3a 5b 69 6e 76 6f 6b 65 | 5f 66 6c 61 67 5d 2c 20 |:[invoke|_flag], |
|00000f20| 30 46 46 68 09 09 3b 20 | 4c 65 61 76 65 20 61 20 |0FFh..; |Leave a |
|00000f30| 66 6c 61 67 20 74 6f 20 | 74 65 6c 6c 20 75 73 20 |flag to |tell us |
|00000f40| 74 6f 0a 09 6a 6d 70 09 | 73 68 6f 72 74 20 69 6e |to..jmp.|short in|
|00000f50| 74 5f 72 65 74 75 72 6e | 0a 0a 6f 6b 32 72 75 6e |t_return|..ok2run|
|00000f60| 3a 0a 09 70 6f 70 09 65 | 73 0a 09 70 6f 70 09 62 |:..pop.e|s..pop.b|
|00000f70| 78 0a 09 63 61 6c 6c 09 | 6d 61 69 6e 09 09 09 09 |x..call.|main....|
|00000f80| 3b 20 43 61 6c 6c 20 4e | 50 52 49 4e 54 0a 0a 69 |; Call N|PRINT..i|
|00000f90| 6e 74 5f 72 65 74 75 72 | 6e 3a 0a 09 69 72 65 74 |nt_retur|n:..iret|
|00000fa0| 09 09 09 09 09 3b 20 61 | 6e 64 20 77 65 20 72 65 |.....; a|nd we re|
|00000fb0| 74 75 72 6e 20 2e 2e 2e | 0a 0a 65 6e 64 70 09 6e |turn ...|..endp.n|
|00000fc0| 70 72 69 6e 74 0a 0a 0a | 3b 2d 2d 2d 2d 2d 2d 2d |print...|;-------|
|00000fd0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00000fe0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00000ff0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001000| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001010| 2d 2d 2d 2d 2d 2d 0a 3b | 20 20 4d 61 69 6e 20 50 |------.;|  Main P|
|00001020| 72 6f 63 65 64 75 72 65 | 20 2d 20 52 65 73 70 6f |rocedure| - Respo|
|00001030| 6e 73 69 62 6c 65 20 66 | 6f 72 20 70 72 6f 63 65 |nsible f|or proce|
|00001040| 73 73 69 6e 67 20 75 73 | 65 72 20 72 65 71 75 65 |ssing us|er reque|
|00001050| 73 74 0a 3b 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |st.;----|--------|
|00001060| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001070| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001080| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001090| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000010a0| 2d 0a 6d 61 69 6e 09 70 | 72 6f 63 09 6e 65 61 72 |-.main.p|roc.near|
|000010b0| 0a 09 73 74 69 09 09 09 | 3b 20 41 6c 6c 6f 77 20 |..sti...|; Allow |
|000010c0| 49 6e 74 65 72 72 75 70 | 74 73 0a 0a 09 70 75 73 |Interrup|ts...pus|
|000010d0| 68 09 62 70 09 09 3b 20 | 41 63 63 65 73 73 20 74 |h.bp..; |Access t|
|000010e0| 6f 20 73 74 61 63 6b 0a | 09 6d 6f 76 09 62 70 2c |o stack.|.mov.bp,|
|000010f0| 73 70 09 09 3b 20 42 65 | 66 6f 72 65 20 77 65 20 |sp..; Be|fore we |
|00001100| 70 75 73 68 20 61 6e 79 | 74 68 69 6e 67 0a 0a 09 |push any|thing...|
|00001110| 70 75 73 68 66 09 09 09 | 3b 20 53 61 76 65 20 74 |pushf...|; Save t|
|00001120| 68 65 20 73 74 61 74 65 | 20 6f 66 20 74 68 65 20 |he state| of the |
|00001130| 6d 61 63 68 69 6e 65 0a | 09 70 75 73 68 09 65 73 |machine.|.push.es|
|00001140| 09 09 3b 20 62 65 63 61 | 75 73 65 20 77 65 27 72 |..; beca|use we'r|
|00001150| 65 20 67 6f 6e 6e 61 20 | 6d 61 6b 65 0a 09 70 75 |e gonna |make..pu|
|00001160| 73 68 09 64 73 09 09 3b | 20 61 20 6d 65 73 73 20 |sh.ds..;| a mess |
|00001170| 6f 66 20 69 74 0a 09 70 | 75 73 68 09 64 69 0a 09 |of it..p|ush.di..|
|00001180| 70 75 73 68 09 73 69 0a | 09 70 75 73 68 09 64 78 |push.si.|.push.dx|
|00001190| 0a 09 70 75 73 68 09 63 | 78 0a 09 70 75 73 68 09 |..push.c|x..push.|
|000011a0| 62 78 0a 09 70 75 73 68 | 09 61 78 0a 0a 09 6d 6f |bx..push|.ax...mo|
|000011b0| 76 09 61 78 2c 63 73 09 | 09 09 3b 20 45 73 74 61 |v.ax,cs.|..; Esta|
|000011c0| 62 6c 69 73 68 20 74 68 | 65 20 70 72 6f 70 65 72 |blish th|e proper|
|000011d0| 20 73 65 67 6d 65 6e 74 | 73 0a 09 6d 6f 76 09 64 | segment|s..mov.d|
|000011e0| 73 2c 61 78 0a 09 6d 6f | 76 09 65 73 2c 61 78 09 |s,ax..mo|v.es,ax.|
|000011f0| 09 09 3b 20 4d 61 6b 65 | 20 45 53 20 70 6f 69 6e |..; Make| ES poin|
|00001200| 74 20 74 6f 20 63 6f 64 | 65 20 73 65 67 6d 65 6e |t to cod|e segmen|
|00001210| 74 0a 09 61 73 73 75 6d | 65 09 64 73 3a 63 73 65 |t..assum|e.ds:cse|
|00001220| 67 2c 20 65 73 3a 63 73 | 65 67 09 3b 20 54 65 6c |g, es:cs|eg.; Tel|
|00001230| 6c 20 74 68 65 20 61 73 | 73 65 6d 62 6c 65 72 0a |l the as|sembler.|
|00001240| 0a 0a 6f 6b 32 6c 6f 61 | 64 3a 0a 09 6d 6f 76 09 |..ok2loa|d:..mov.|
|00001250| 5b 69 6e 76 6f 6b 65 5f | 66 6c 61 67 5d 2c 20 30 |[invoke_|flag], 0|
|00001260| 68 09 3b 20 43 6c 65 61 | 72 20 49 6e 76 6f 63 61 |h.; Clea|r Invoca|
|00001270| 74 69 6f 6e 20 66 6c 61 | 67 0a 0a 09 6d 6f 76 09 |tion fla|g...mov.|
|00001280| 61 68 2c 30 66 68 09 09 | 09 3b 20 47 65 74 20 74 |ah,0fh..|.; Get t|
|00001290| 68 65 20 63 75 72 72 65 | 6e 74 20 44 69 73 70 6c |he curre|nt Displ|
|000012a0| 61 79 20 4d 6f 64 65 0a | 09 69 6e 74 09 56 49 44 |ay Mode.|.int.VID|
|000012b0| 45 4f 0a 09 6d 6f 76 09 | 5b 64 69 73 70 6c 61 79 |EO..mov.|[display|
|000012c0| 5f 70 61 67 65 5d 2c 62 | 68 09 3b 20 53 61 76 65 |_page],b|h.; Save|
|000012d0| 20 63 75 72 72 65 6e 74 | 20 70 61 67 65 0a 09 63 | current| page..c|
|000012e0| 6d 70 09 61 6c 2c 30 37 | 68 09 09 09 3b 20 49 73 |mp.al,07|h...; Is|
|000012f0| 20 74 68 69 73 20 61 20 | 4d 6f 6e 6f 63 68 72 6f | this a |Monochro|
|00001300| 6d 65 20 4d 6f 6e 69 74 | 6f 72 20 3f 0a 09 6a 65 |me Monit|or ?..je|
|00001310| 09 6d 6f 6e 6f 09 09 09 | 3b 20 59 65 73 2c 20 73 |.mono...|; Yes, s|
|00001320| 6f 20 77 65 20 61 72 65 | 20 6f 6b 61 79 0a 09 63 |o we are| okay..c|
|00001330| 6d 70 09 61 6c 2c 30 33 | 68 09 09 09 3b 20 49 73 |mp.al,03|h...; Is|
|00001340| 20 74 68 69 73 20 61 20 | 43 47 41 20 4d 6f 6e 69 | this a |CGA Moni|
|00001350| 74 6f 72 20 69 6e 20 38 | 30 20 63 6f 6c 20 6d 6f |tor in 8|0 col mo|
|00001360| 64 65 3f 0a 09 6a 65 09 | 63 67 61 09 09 09 3b 20 |de?..je.|cga...; |
|00001370| 59 65 73 2c 20 73 6f 20 | 77 65 20 61 72 65 20 6f |Yes, so |we are o|
|00001380| 6b 61 79 0a 09 63 61 6c | 6c 09 72 69 6e 67 5f 62 |kay..cal|l.ring_b|
|00001390| 65 6c 6c 09 09 3b 20 4e | 6f 20 2d 20 73 6f 20 64 |ell..; N|o - so d|
|000013a0| 6f 6e 27 74 20 65 78 65 | 63 75 74 65 2e 20 20 4a |on't exe|cute.  J|
|000013b0| 75 73 74 20 61 62 6f 72 | 74 2e 0a 09 6a 6d 70 09 |ust abor|t...jmp.|
|000013c0| 64 6f 6e 65 09 09 09 3b | 20 45 78 69 74 20 4e 50 |done...;| Exit NP|
|000013d0| 52 49 4e 54 0a 0a 6d 6f | 6e 6f 3a 0a 09 6d 6f 76 |RINT..mo|no:..mov|
|000013e0| 09 61 78 2c 4d 4f 4e 4f | 53 43 52 09 3b 20 4d 6f |.ax,MONO|SCR.; Mo|
|000013f0| 6e 6f 63 68 72 6f 6d 65 | 20 44 69 73 70 6c 61 79 |nochrome| Display|
|00001400| 0a 09 6a 6d 70 09 73 68 | 6f 72 74 20 73 61 76 65 |..jmp.sh|ort save|
|00001410| 6c 69 6e 65 0a 63 67 61 | 3a 0a 09 6d 6f 76 09 61 |line.cga|:..mov.a|
|00001420| 78 2c 43 4f 4c 4f 52 53 | 43 52 09 3b 20 43 47 41 |x,COLORS|CR.; CGA|
|00001430| 20 64 69 73 70 6c 61 79 | 0a 0a 73 61 76 65 6c 69 | display|..saveli|
|00001440| 6e 65 3a 0a 09 6d 6f 76 | 09 64 73 2c 61 78 09 09 |ne:..mov|.ds,ax..|
|00001450| 3b 20 53 65 74 20 75 70 | 20 74 68 65 20 44 61 74 |; Set up| the Dat|
|00001460| 61 20 53 65 67 6d 65 6e | 74 0a 09 6d 6f 76 09 73 |a Segmen|t..mov.s|
|00001470| 69 2c 33 38 34 30 09 09 | 3b 20 53 74 61 72 74 20 |i,3840..|; Start |
|00001480| 61 74 20 70 6f 73 69 74 | 69 6f 6e 20 72 6f 77 3d |at posit|ion row=|
|00001490| 32 35 2c 20 63 6f 6c 75 | 6d 6e 3d 31 0a 09 6d 6f |25, colu|mn=1..mo|
|000014a0| 76 09 63 78 2c 38 30 09 | 09 3b 20 38 30 20 43 68 |v.cx,80.|.; 80 Ch|
|000014b0| 61 72 61 63 74 65 72 20 | 6c 69 6e 65 73 0a 09 6c |aracter |lines..l|
|000014c0| 65 61 09 64 69 2c 20 73 | 63 72 65 65 6e 62 75 66 |ea.di, s|creenbuf|
|000014d0| 0a 09 70 75 73 68 09 65 | 73 09 09 3b 20 53 61 76 |..push.e|s..; Sav|
|000014e0| 65 20 73 63 72 65 65 6e | 20 6d 65 6d 6f 72 79 20 |e screen| memory |
|000014f0| 6c 6f 63 61 74 69 6f 6e | 73 0a 09 70 75 73 68 09 |location|s..push.|
|00001500| 64 73 0a 09 70 75 73 68 | 09 73 69 0a 09 63 6c 64 |ds..push|.si..cld|
|00001510| 09 09 09 3b 20 4d 61 6b | 65 20 73 75 72 65 20 77 |...; Mak|e sure w|
|00001520| 65 20 63 6f 70 79 20 66 | 72 6f 6d 20 72 69 67 68 |e copy f|rom righ|
|00001530| 74 20 74 6f 20 6c 65 66 | 74 0a 09 72 65 70 09 6d |t to lef|t..rep.m|
|00001540| 6f 76 73 77 09 09 3b 20 | 4d 6f 76 65 20 63 68 61 |ovsw..; |Move cha|
|00001550| 72 61 63 74 65 72 20 26 | 20 41 74 74 72 69 62 75 |racter &| Attribu|
|00001560| 74 65 0a 0a 09 6d 6f 76 | 09 61 78 2c 63 73 09 09 |te...mov|.ax,cs..|
|00001570| 3b 20 52 65 73 74 6f 72 | 65 20 74 68 65 20 44 61 |; Restor|e the Da|
|00001580| 74 61 20 53 65 67 6d 65 | 6e 74 0a 09 6d 6f 76 09 |ta Segme|nt..mov.|
|00001590| 64 73 2c 61 78 0a 0a 09 | 6d 6f 76 09 61 68 2c 30 |ds,ax...|mov.ah,0|
|000015a0| 33 68 09 09 3b 20 47 65 | 74 20 74 68 65 20 43 75 |3h..; Ge|t the Cu|
|000015b0| 72 72 65 6e 74 20 43 75 | 72 73 6f 72 20 50 6f 73 |rrent Cu|rsor Pos|
|000015c0| 69 74 69 6f 6e 0a 09 69 | 6e 74 09 56 49 44 45 4f |ition..i|nt.VIDEO|
|000015d0| 0a 09 6d 6f 76 09 5b 63 | 75 72 73 6f 72 5d 2c 20 |..mov.[c|ursor], |
|000015e0| 64 78 09 3b 20 20 20 20 | 61 6e 64 20 73 61 76 65 |dx.;    |and save|
|000015f0| 20 69 74 2e 0a 0a 09 63 | 61 6c 6c 09 63 6c 65 61 | it....c|all.clea|
|00001600| 72 5f 32 35 09 3b 20 47 | 6f 74 6f 20 61 6e 64 20 |r_25.; G|oto and |
|00001610| 43 6c 65 61 72 20 4c 69 | 6e 65 20 23 32 35 0a 09 |Clear Li|ne #25..|
|00001620| 6c 65 61 09 73 69 2c 20 | 70 72 6f 6d 70 74 09 3b |lea.si, |prompt.;|
|00001630| 20 44 69 73 70 6c 61 79 | 20 74 68 65 20 66 69 6c | Display| the fil|
|00001640| 65 6e 61 6d 65 20 70 72 | 6f 6d 70 74 20 66 6f 72 |ename pr|ompt for|
|00001650| 20 74 68 65 20 75 73 65 | 72 0a 09 63 61 6c 6c 09 | the use|r..call.|
|00001660| 77 72 5f 73 74 72 69 6e | 67 0a 0a 09 6c 65 61 09 |wr_strin|g...lea.|
|00001670| 64 78 2c 66 69 6c 65 6e | 61 6d 65 09 3b 20 50 6f |dx,filen|ame.; Po|
|00001680| 69 6e 74 20 74 6f 20 6f | 75 74 20 66 69 6c 65 6e |int to o|ut filen|
|00001690| 61 6d 65 20 62 75 66 66 | 65 72 0a 09 6d 6f 76 09 |ame buff|er..mov.|
|000016a0| 61 78 2c 36 30 09 09 3b | 20 4c 69 6d 69 74 20 66 |ax,60..;| Limit f|
|000016b0| 69 6c 65 6e 61 6d 65 20 | 74 6f 20 36 30 20 63 68 |ilename |to 60 ch|
|000016c0| 61 72 61 63 74 65 72 73 | 0a 09 63 61 6c 6c 09 72 |aracters|..call.r|
|000016d0| 64 5f 73 74 72 69 6e 67 | 09 3b 20 52 65 71 75 65 |d_string|.; Reque|
|000016e0| 73 74 20 74 68 65 20 66 | 69 6c 65 6e 61 6d 65 20 |st the f|ilename |
|000016f0| 66 72 6f 6d 20 74 68 65 | 20 75 73 65 72 0a 09 0a |from the| user...|
|00001700| 09 63 6d 70 09 61 78 2c | 30 09 09 3b 20 44 69 64 |.cmp.ax,|0..; Did|
|00001710| 20 77 65 20 67 65 74 20 | 61 20 66 69 6c 65 20 6e | we get |a file n|
|00001720| 61 6d 65 20 3f 3f 3f 0a | 09 6a 6e 65 09 73 75 62 |ame ???.|.jne.sub|
|00001730| 6d 69 74 5f 66 69 6c 65 | 09 3b 20 4e 6f 2c 20 73 |mit_file|.; No, s|
|00001740| 6f 20 64 6f 6e 27 74 20 | 64 6f 20 74 68 65 20 70 |o don't |do the p|
|00001750| 72 69 6e 74 20 72 6f 75 | 74 69 6e 65 0a 09 6d 6f |rint rou|tine..mo|
|00001760| 76 09 61 68 2c 30 32 68 | 09 09 3b 20 4c 65 74 27 |v.ah,02h|..; Let'|
|00001770| 73 20 73 65 65 20 69 66 | 20 74 68 65 20 70 72 69 |s see if| the pri|
|00001780| 6e 74 65 72 20 69 73 20 | 62 75 73 79 0a 09 6d 6f |nter is |busy..mo|
|00001790| 76 09 64 78 2c 30 09 09 | 3b 20 43 68 65 63 6b 20 |v.dx,0..|; Check |
|000017a0| 70 72 69 6e 74 65 72 20 | 6e 75 6d 62 65 72 20 30 |printer |number 0|
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|000017c0| 65 73 74 09 61 68 2c 30 | 31 31 30 31 30 30 31 42 |est.ah,0|1101001B|
|000017d0| 09 3b 20 43 6c 65 61 72 | 20 62 69 74 73 20 38 2c |.; Clear| bits 8,|
|000017e0| 35 2c 33 2c 32 20 2d 3e | 20 6d 65 61 6e 69 6e 67 |5,3,2 ->| meaning|
|000017f0| 6c 65 73 73 20 74 6f 20 | 75 73 0a 09 6a 7a 09 70 |less to |us..jz.p|
|00001800| 72 74 73 63 5f 6f 6b 61 | 79 0a 09 6c 65 61 09 73 |rtsc_oka|y..lea.s|
|00001810| 69 2c 20 6e 6f 5f 70 72 | 69 6e 74 09 3b 20 4e 6f |i, no_pr|int.; No|
|00001820| 2c 20 74 68 65 6e 20 74 | 68 65 72 65 20 69 73 20 |, then t|here is |
|00001830| 61 20 70 72 6f 62 6c 65 | 6d 20 77 2f 0a 09 63 61 |a proble|m w/..ca|
|00001840| 6c 6c 09 63 6c 65 61 72 | 5f 32 35 09 3b 20 20 20 |ll.clear|_25.;   |
|00001850| 74 68 65 20 70 72 69 6e | 74 65 72 2e 20 20 54 65 |the prin|ter.  Te|
|00001860| 6c 6c 20 74 68 65 20 75 | 73 65 72 20 61 62 6f 75 |ll the u|ser abou|
|00001870| 74 20 69 74 0a 09 63 61 | 6c 6c 09 72 69 6e 67 5f |t it..ca|ll.ring_|
|00001880| 62 65 6c 6c 0a 09 63 61 | 6c 6c 09 77 72 5f 73 74 |bell..ca|ll.wr_st|
|00001890| 72 69 6e 67 0a 09 63 61 | 6c 6c 09 70 61 75 73 65 |ring..ca|ll.pause|
|000018a0| 0a 09 6a 6d 70 09 72 65 | 73 74 73 63 72 65 65 6e |..jmp.re|stscreen|
|000018b0| 09 3b 20 4e 6f 20 73 65 | 6e 73 65 20 70 72 69 6e |.; No se|nse prin|
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|000018d0| 77 2c 20 73 6f 20 64 6f | 6e 27 74 0a 0a 70 72 74 |w, so do|n't..prt|
|000018e0| 73 63 5f 6f 6b 61 79 3a | 0a 09 6d 6f 76 09 5b 64 |sc_okay:|..mov.[d|
|000018f0| 6f 5f 70 72 74 73 63 5d | 2c 30 46 46 68 09 3b 20 |o_prtsc]|,0FFh.; |
|00001900| 53 65 74 20 74 68 65 20 | 50 72 69 6e 74 20 53 63 |Set the |Print Sc|
|00001910| 72 65 65 6e 20 46 6c 61 | 67 0a 09 6a 6d 70 09 72 |reen Fla|g..jmp.r|
|00001920| 65 73 74 73 63 72 65 65 | 6e 0a 0a 73 75 62 6d 69 |estscree|n..submi|
|00001930| 74 5f 66 69 6c 65 3a 0a | 09 6d 6f 76 09 5b 64 6f |t_file:.|.mov.[do|
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|00001950| 61 72 20 74 68 65 20 50 | 72 69 6e 74 20 53 63 72 |ar the P|rint Scr|
|00001960| 65 65 6e 20 46 6c 61 67 | 0a 09 6d 6f 76 09 77 6f |een Flag|..mov.wo|
|00001970| 72 64 20 70 74 72 20 5b | 70 72 69 6e 74 70 61 63 |rd ptr [|printpac|
|00001980| 6b 5d 2b 33 2c 64 73 09 | 3b 20 50 75 74 20 74 68 |k]+3,ds.|; Put th|
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|000019a0| 61 63 6b 65 74 0a 09 6d | 6f 76 09 77 6f 72 64 20 |acket..m|ov.word |
|000019b0| 70 74 72 20 5b 70 72 69 | 6e 74 70 61 63 6b 5d 2b |ptr [pri|ntpack]+|
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|000019e0| 6c 65 61 09 64 78 2c 70 | 72 69 6e 74 70 61 63 6b |lea.dx,p|rintpack|
|000019f0| 09 3b 20 50 6f 69 6e 74 | 20 74 6f 20 74 68 65 20 |.; Point| to the |
|00001a00| 70 72 69 6e 74 65 72 20 | 72 65 71 75 65 73 74 20 |printer |request |
|00001a10| 70 61 63 6b 65 74 0a 09 | 6d 6f 76 09 61 78 2c 30 |packet..|mov.ax,0|
|00001a20| 31 30 31 68 09 3b 20 53 | 75 62 6d 69 74 20 70 61 |101h.; S|ubmit pa|
|00001a30| 63 6b 65 74 20 74 6f 20 | 50 72 69 6e 74 20 53 70 |cket to |Print Sp|
|00001a40| 6f 6f 6c 65 72 0a 09 69 | 6e 74 09 4d 55 4c 54 49 |ooler..i|nt.MULTI|
|00001a50| 50 4c 45 58 09 3b 20 49 | 6e 76 6f 6b 65 20 4d 75 |PLEX.; I|nvoke Mu|
|00001a60| 6c 74 69 70 6c 65 78 20 | 53 65 72 76 69 63 65 20 |ltiplex |Service |
|00001a70| 49 6e 74 65 72 72 75 70 | 74 20 66 6f 72 20 50 52 |Interrup|t for PR|
|00001a80| 49 4e 54 0a 09 6a 6e 63 | 09 72 65 73 74 73 63 72 |INT..jnc|.restscr|
|00001a90| 65 65 6e 09 3b 20 49 66 | 20 74 68 65 20 63 61 72 |een.; If| the car|
|00001aa0| 72 79 20 66 6c 61 67 20 | 69 73 20 73 65 74 2c 20 |ry flag |is set, |
|00001ab0| 74 68 65 6e 20 77 65 20 | 68 61 64 20 61 6e 20 65 |then we |had an e|
|00001ac0| 72 72 6f 72 0a 0a 09 63 | 6d 70 09 61 78 2c 30 39 |rror...c|mp.ax,09|
|00001ad0| 68 09 09 3b 20 49 73 20 | 74 68 65 20 73 70 6f 6f |h..; Is |the spoo|
|00001ae0| 6c 65 72 20 62 75 73 79 | 20 3f 20 20 20 28 4e 4f |ler busy| ?   (NO|
|00001af0| 54 45 3a 20 65 6e 64 6c | 65 73 73 20 6c 6f 6f 70 |TE: endl|ess loop|
|00001b00| 3f 29 0a 09 6a 65 09 72 | 65 74 72 79 5f 66 69 6c |?)..je.r|etry_fil|
|00001b10| 65 09 3b 20 59 65 73 2c | 20 73 6f 20 74 72 79 20 |e.; Yes,| so try |
|00001b20| 61 67 61 69 6e 0a 09 63 | 61 6c 6c 09 64 69 73 70 |again..c|all.disp|
|00001b30| 6c 61 79 5f 65 72 72 6d | 73 67 09 3b 20 53 6f 6d |lay_errm|sg.; Som|
|00001b40| 65 20 6f 74 68 65 72 20 | 6b 69 6e 64 20 6f 66 20 |e other |kind of |
|00001b50| 65 72 72 6f 72 0a 0a 72 | 65 73 74 73 63 72 65 65 |error..r|estscree|
|00001b60| 6e 3a 0a 09 6c 65 61 09 | 73 69 2c 20 73 63 72 65 |n:..lea.|si, scre|
|00001b70| 65 6e 62 75 66 09 3b 20 | 50 6f 69 6e 74 20 74 6f |enbuf.; |Point to|
|00001b80| 20 6f 75 72 20 73 63 72 | 65 65 6e 20 62 75 66 66 | our scr|een buff|
|00001b90| 65 72 0a 09 70 6f 70 09 | 64 69 09 09 3b 20 52 65 |er..pop.|di..; Re|
|00001ba0| 73 74 6f 72 65 20 53 63 | 72 65 65 6e 20 4d 65 6d |store Sc|reen Mem|
|00001bb0| 6f 72 79 20 4c 6f 63 61 | 74 69 6f 6e 73 0a 09 70 |ory Loca|tions..p|
|00001bc0| 6f 70 09 65 73 0a 09 70 | 6f 70 09 64 73 09 09 3b |op.es..p|op.ds..;|
|00001bd0| 20 52 65 73 74 6f 72 65 | 20 74 68 65 20 44 61 74 | Restore| the Dat|
|00001be0| 61 20 53 65 67 6d 65 6e | 74 0a 09 6d 6f 76 09 63 |a Segmen|t..mov.c|
|00001bf0| 78 2c 38 30 09 09 3b 20 | 53 74 69 6c 6c 20 6e 61 |x,80..; |Still na|
|00001c00| 6d 65 20 38 30 20 63 68 | 61 72 61 63 74 65 72 20 |me 80 ch|aracter |
|00001c10| 6c 69 6e 65 0a 09 63 6c | 64 09 09 09 3b 20 4d 61 |line..cl|d...; Ma|
|00001c20| 6b 65 20 73 75 72 65 20 | 77 65 20 63 6f 70 79 20 |ke sure |we copy |
|00001c30| 66 72 6f 6d 20 72 69 67 | 68 74 20 74 6f 20 6c 65 |from rig|ht to le|
|00001c40| 66 74 0a 09 72 65 70 09 | 6d 6f 76 73 77 0a 0a 09 |ft..rep.|movsw...|
|00001c50| 6d 6f 76 09 61 78 2c 63 | 73 09 09 3b 20 52 65 73 |mov.ax,c|s..; Res|
|00001c60| 74 6f 72 65 20 74 68 65 | 20 44 61 74 61 20 61 6e |tore the| Data an|
|00001c70| 64 20 45 78 74 65 6e 64 | 65 64 20 53 65 67 6d 65 |d Extend|ed Segme|
|00001c80| 6e 74 20 76 61 6c 75 65 | 73 0a 09 6d 6f 76 09 64 |nt value|s..mov.d|
|00001c90| 73 2c 61 78 0a 09 6d 6f | 76 09 65 73 2c 61 78 0a |s,ax..mo|v.es,ax.|
|00001ca0| 0a 09 6d 6f 76 09 64 78 | 2c 5b 63 75 72 73 6f 72 |..mov.dx|,[cursor|
|00001cb0| 5d 09 3b 20 52 65 73 74 | 6f 72 65 20 74 68 65 20 |].; Rest|ore the |
|00001cc0| 63 75 72 73 6f 72 20 70 | 6f 73 69 74 69 6f 6e 20 |cursor p|osition |
|00001cd0| 74 6f 20 77 68 61 74 20 | 69 74 20 77 61 73 0a 09 |to what |it was..|
|00001ce0| 6d 6f 76 09 62 68 2c 5b | 64 69 73 70 6c 61 79 5f |mov.bh,[|display_|
|00001cf0| 70 61 67 65 5d 0a 09 6d | 6f 76 09 61 68 2c 30 32 |page]..m|ov.ah,02|
|00001d00| 68 0a 09 69 6e 74 09 56 | 49 44 45 4f 0a 0a 3b 2d |h..int.V|IDEO..;-|
|00001d10| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001d20| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001d30| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001d40| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001d50| 2d 2d 2d 2d 2d 0a 3b 20 | 52 65 73 74 6f 72 65 20 |-----.; |Restore |
|00001d60| 74 68 65 20 73 74 61 74 | 65 20 6f 66 20 74 68 65 |the stat|e of the|
|00001d70| 20 6d 61 63 68 69 6e 65 | 20 77 68 65 6e 20 49 6e | machine| when In|
|00001d80| 74 20 30 35 20 6f 63 63 | 75 72 65 64 0a 3b 2d 2d |t 05 occ|ured.;--|
|00001d90| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001da0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001db0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001dc0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00001dd0| 2d 2d 2d 2d 0a 64 6f 6e | 65 3a 0a 09 70 6f 70 09 |----.don|e:..pop.|
|00001de0| 61 78 0a 09 70 6f 70 09 | 62 78 0a 09 70 6f 70 09 |ax..pop.|bx..pop.|
|00001df0| 63 78 0a 09 70 6f 70 09 | 64 78 0a 09 70 6f 70 09 |cx..pop.|dx..pop.|
|00001e00| 73 69 0a 09 70 6f 70 09 | 64 69 0a 09 70 6f 70 09 |si..pop.|di..pop.|
|00001e10| 64 73 0a 09 70 6f 70 09 | 65 73 0a 09 70 6f 70 66 |ds..pop.|es..popf|
|00001e20| 0a 09 70 6f 70 09 62 70 | 0a 0a 49 46 44 45 46 20 |..pop.bp|..IFDEF |
|00001e30| 44 45 42 55 47 0a 09 6d | 6f 76 09 61 78 2c 34 63 |DEBUG..m|ov.ax,4c|
|00001e40| 30 30 68 0a 09 69 6e 74 | 09 44 4f 53 0a 45 4e 44 |00h..int|.DOS.END|
|00001e50| 49 46 0a 0a 61 73 73 75 | 6d 65 09 64 73 3a 6e 6f |IF..assu|me.ds:no|
|00001e60| 74 68 69 6e 67 2c 20 65 | 73 3a 6e 6f 74 68 69 6e |thing, e|s:nothin|
|00001e70| 67 0a 09 63 6d 70 09 63 | 73 3a 5b 64 6f 5f 70 72 |g..cmp.c|s:[do_pr|
|00001e80| 74 73 63 5d 2c 30 46 46 | 68 09 3b 20 49 73 20 74 |tsc],0FF|h.; Is t|
|00001e90| 68 65 20 50 72 69 6e 74 | 20 53 63 72 65 65 6e 20 |he Print| Screen |
|00001ea0| 66 6c 61 67 20 73 65 74 | 20 3f 0a 09 6a 6e 65 09 |flag set| ?..jne.|
|00001eb0| 6e 70 72 69 6e 74 5f 65 | 78 69 74 09 09 3b 20 6e |nprint_e|xit..; n|
|00001ec0| 6f 2c 20 73 6f 20 77 65 | 20 73 68 6f 75 6c 64 20 |o, so we| should |
|00001ed0| 6a 75 73 74 20 65 78 69 | 74 0a 0a 09 70 75 73 68 |just exi|t...push|
|00001ee0| 66 09 09 09 09 3b 20 50 | 75 73 68 20 74 68 65 20 |f....; P|ush the |
|00001ef0| 66 6c 61 67 73 0a 09 63 | 6c 69 09 09 09 09 3b 20 |flags..c|li....; |
|00001f00| 44 69 73 61 62 6c 65 20 | 69 6e 74 65 72 72 75 70 |Disable |interrup|
|00001f10| 74 73 0a 09 70 75 73 68 | 09 63 73 09 09 09 3b 20 |ts..push|.cs...; |
|00001f20| 50 75 73 68 20 74 68 65 | 20 43 53 20 72 65 67 69 |Push the| CS regi|
|00001f30| 73 74 65 72 0a 09 6d 6f | 76 09 64 69 2c 6f 66 66 |ster..mo|v.di,off|
|00001f40| 73 65 74 20 63 73 3a 66 | 6f 72 6d 66 65 65 64 0a |set cs:f|ormfeed.|
|00001f50| 09 70 75 73 68 09 64 69 | 0a 09 6a 6d 70 09 64 77 |.push.di|..jmp.dw|
|00001f60| 6f 72 64 20 70 74 72 20 | 63 73 3a 6f 6c 64 5f 69 |ord ptr |cs:old_i|
|00001f70| 6e 74 5f 35 09 3b 20 54 | 72 61 6e 73 66 65 72 20 |nt_5.; T|ransfer |
|00001f80| 63 6f 6e 74 72 6f 6c 20 | 74 6f 20 6f 6c 64 20 69 |control |to old i|
|00001f90| 6e 74 20 30 35 68 0a 0a | 66 6f 72 6d 66 65 65 64 |nt 05h..|formfeed|
|00001fa0| 3a 0a 09 70 75 73 68 66 | 09 09 09 3b 20 53 61 76 |:..pushf|...; Sav|
|00001fb0| 65 20 74 68 65 20 73 74 | 61 74 65 20 6f 66 20 74 |e the st|ate of t|
|00001fc0| 68 65 20 6d 61 63 68 69 | 6e 65 20 79 65 74 20 61 |he machi|ne yet a|
|00001fd0| 67 61 69 6e 0a 09 70 75 | 73 68 09 65 73 0a 09 70 |gain..pu|sh.es..p|
|00001fe0| 75 73 68 09 64 73 0a 09 | 70 75 73 68 09 64 69 0a |ush.ds..|push.di.|
|00001ff0| 09 70 75 73 68 09 73 69 | 0a 09 70 75 73 68 09 64 |.push.si|..push.d|
|00002000| 78 0a 09 70 75 73 68 09 | 63 78 0a 09 70 75 73 68 |x..push.|cx..push|
|00002010| 09 62 78 0a 09 70 75 73 | 68 09 61 78 0a 09 61 73 |.bx..pus|h.ax..as|
|00002020| 73 75 6d 65 09 64 73 3a | 63 73 65 67 2c 20 65 73 |sume.ds:|cseg, es|
|00002030| 3a 63 73 65 67 09 3b 54 | 65 6c 6c 20 74 68 65 20 |:cseg.;T|ell the |
|00002040| 61 73 73 65 6d 62 6c 65 | 72 0a 0a 09 6d 6f 76 09 |assemble|r...mov.|
|00002050| 61 68 2c 30 30 68 09 09 | 3b 20 50 72 69 6e 74 20 |ah,00h..|; Print |
|00002060| 61 20 63 68 61 72 61 63 | 74 65 72 0a 09 6d 6f 76 |a charac|ter..mov|
|00002070| 09 61 6c 2c 30 63 68 09 | 09 3b 20 4e 61 6d 65 6c |.al,0ch.|.; Namel|
|00002080| 79 20 61 20 46 6f 72 6d | 66 65 65 64 20 28 5e 4c |y a Form|feed (^L|
|00002090| 29 0a 09 6d 6f 76 09 64 | 78 2c 30 09 09 3b 20 50 |)..mov.d|x,0..; P|
|000020a0| 72 69 6e 74 65 72 20 6e | 75 6d 62 65 72 20 6f 6e |rinter n|umber on|
|000020b0| 65 0a 09 69 6e 74 09 50 | 52 49 4e 54 45 52 09 09 |e..int.P|RINTER..|
|000020c0| 3b 20 49 6e 76 6f 6b 65 | 20 50 72 69 6e 74 20 49 |; Invoke| Print I|
|000020d0| 6e 74 65 72 72 75 70 74 | 0a 0a 09 70 6f 70 09 61 |nterrupt|...pop.a|
|000020e0| 78 09 09 3b 20 52 65 73 | 74 6f 72 65 20 65 76 65 |x..; Res|tore eve|
|000020f0| 72 79 74 68 69 6e 67 20 | 61 67 61 69 6e 0a 09 70 |rything |again..p|
|00002100| 6f 70 09 62 78 0a 09 70 | 6f 70 09 63 78 0a 09 70 |op.bx..p|op.cx..p|
|00002110| 6f 70 09 64 78 0a 09 70 | 6f 70 09 73 69 0a 09 70 |op.dx..p|op.si..p|
|00002120| 6f 70 09 64 69 0a 09 70 | 6f 70 09 64 73 0a 09 70 |op.di..p|op.ds..p|
|00002130| 6f 70 09 65 73 0a 09 70 | 6f 70 66 0a 0a 6e 70 72 |op.es..p|opf..npr|
|00002140| 69 6e 74 5f 65 78 69 74 | 3a 0a 09 72 65 74 09 09 |int_exit|:..ret..|
|00002150| 09 09 3b 20 41 6e 64 20 | 77 65 20 72 65 74 75 72 |..; And |we retur|
|00002160| 6e 20 2e 2e 2e 0a 6d 61 | 69 6e 09 65 6e 64 70 0a |n ....ma|in.endp.|
|00002170| 0a 0a 3b 3d 3d 3d 3d 3d | 3d 3d 3d 3d 3d 3d 3d 3d |..;=====|========|
|00002180| 3d 3d 3d 3d 3d 3d 3d 3d | 3d 3d 3d 3d 3d 3d 3d 3d |========|========|
|00002190| 3d 3d 3d 3d 3d 3d 3d 3d | 3d 3d 3d 3d 3d 3d 3d 3d |========|========|
|000021a0| 3d 3d 3d 3d 3d 3d 3d 3d | 3d 3d 3d 3d 3d 3d 3d 3d |========|========|
|000021b0| 3d 3d 3d 3d 3d 3d 3d 3d | 3d 0a 3b 20 57 52 5f 53 |========|=.; WR_S|
|000021c0| 54 52 49 4e 47 20 2d 20 | 77 72 69 74 65 20 73 74 |TRING - |write st|
|000021d0| 72 69 6e 67 20 74 6f 20 | 63 6f 6e 73 6f 6c 65 20 |ring to |console |
|000021e0| 61 74 20 73 70 65 63 69 | 66 69 65 64 20 6c 6f 63 |at speci|fied loc|
|000021f0| 61 74 69 6f 6e 2e 0a 3b | 09 54 68 65 20 73 74 72 |ation..;|.The str|
|00002200| 69 6e 67 20 69 73 20 41 | 53 43 49 49 5a 2e 20 20 |ing is A|SCIIZ.  |
|00002210| 20 41 6c 6c 20 72 65 67 | 69 73 74 65 72 73 20 61 | All reg|isters a|
|00002220| 72 65 20 70 72 65 73 65 | 72 76 65 64 2e 0a 3b 2d |re prese|rved..;-|
|00002230| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002240| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002250| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002260| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002270| 2d 2d 2d 2d 2d 0a 77 72 | 5f 73 74 72 69 6e 67 09 |-----.wr|_string.|
|00002280| 70 72 6f 63 09 6e 65 61 | 72 0a 0a 09 09 70 75 73 |proc.nea|r....pus|
|00002290| 68 09 73 69 0a 09 09 70 | 75 73 68 09 62 78 0a 09 |h.si...p|ush.bx..|
|000022a0| 09 70 75 73 68 09 63 78 | 0a 09 09 70 75 73 68 09 |.push.cx|...push.|
|000022b0| 61 78 0a 0a 77 6e 65 78 | 74 5f 63 68 61 72 3a 0a |ax..wnex|t_char:.|
|000022c0| 09 09 6c 6f 64 73 62 09 | 09 09 09 3b 20 4c 6f 61 |..lodsb.|...; Loa|
|000022d0| 64 20 63 68 61 72 20 69 | 6e 20 41 4c 20 66 72 6f |d char i|n AL fro|
|000022e0| 6d 20 44 53 3a 53 49 0a | 09 09 6f 72 09 61 6c 2c |m DS:SI.|..or.al,|
|000022f0| 61 6c 09 09 09 3b 20 49 | 66 20 63 68 61 72 20 69 |al...; I|f char i|
|00002300| 73 20 30 0a 09 09 6a 7a | 09 65 6e 64 5f 73 74 72 |s 0...jz|.end_str|
|00002310| 69 6e 67 09 09 3b 20 20 | 20 54 68 65 6e 20 65 6e |ing..;  | Then en|
|00002320| 64 20 6f 66 20 41 53 43 | 49 49 5a 20 73 74 72 69 |d of ASC|IIZ stri|
|00002330| 6e 67 0a 09 09 6d 6f 76 | 09 61 68 2c 30 39 68 09 |ng...mov|.ah,09h.|
|00002340| 09 09 3b 20 20 20 45 6c | 73 65 2c 20 77 72 69 74 |..;   El|se, writ|
|00002350| 65 20 54 54 59 0a 09 09 | 6d 6f 76 09 62 68 2c 5b |e TTY...|mov.bh,[|
|00002360| 64 69 73 70 6c 61 79 5f | 70 61 67 65 5d 0a 09 09 |display_|page]...|
|00002370| 6d 6f 76 09 62 6c 2c 5b | 70 72 5f 61 74 74 72 69 |mov.bl,[|pr_attri|
|00002380| 62 75 74 65 5d 0a 09 09 | 6d 6f 76 09 63 78 2c 30 |bute]...|mov.cx,0|
|00002390| 31 68 09 09 09 3b 20 4f | 6e 6c 79 20 6f 6e 65 0a |1h...; O|nly one.|
|000023a0| 09 09 69 6e 74 09 56 49 | 44 45 4f 09 09 09 3b 20 |..int.VI|DEO...; |
|000023b0| 20 20 74 68 72 75 20 42 | 49 4f 53 0a 09 09 6d 6f |  thru B|IOS...mo|
|000023c0| 76 09 61 6c 2c 31 0a 09 | 09 63 61 6c 6c 09 6d 6f |v.al,1..|.call.mo|
|000023d0| 76 65 5f 63 75 72 73 6f | 72 09 09 3b 20 4d 6f 76 |ve_curso|r..; Mov|
|000023e0| 65 20 74 68 65 20 63 75 | 72 73 6f 72 20 74 6f 20 |e the cu|rsor to |
|000023f0| 74 68 65 20 72 69 67 68 | 74 0a 09 09 6a 6d 70 09 |the righ|t...jmp.|
|00002400| 73 68 6f 72 74 20 77 6e | 65 78 74 5f 63 68 61 72 |short wn|ext_char|
|00002410| 09 3b 20 20 20 61 6e 64 | 20 64 6f 20 69 74 20 61 |.;   and| do it a|
|00002420| 6c 6c 20 61 67 61 69 6e | 0a 65 6e 64 5f 73 74 72 |ll again|.end_str|
|00002430| 69 6e 67 3a 0a 09 09 70 | 6f 70 09 61 78 0a 09 09 |ing:...p|op.ax...|
|00002440| 70 6f 70 09 63 78 0a 09 | 09 70 6f 70 09 62 78 0a |pop.cx..|.pop.bx.|
|00002450| 09 09 70 6f 70 09 73 69 | 0a 09 09 72 65 74 0a 0a |..pop.si|...ret..|
|00002460| 77 72 5f 73 74 72 69 6e | 67 09 65 6e 64 70 0a 0a |wr_strin|g.endp..|
|00002470| 0a 3b 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |.;------|--------|
|00002480| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002490| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000024a0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000024b0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 0a |--------|-------.|
|000024c0| 3b 20 52 65 61 64 20 61 | 20 53 74 72 69 6e 67 20 |; Read a| String |
|000024d0| 66 72 6f 6d 20 74 68 65 | 20 4b 65 79 62 6f 61 72 |from the| Keyboar|
|000024e0| 64 20 61 6e 64 20 72 65 | 74 75 72 6e 73 20 61 20 |d and re|turns a |
|000024f0| 70 6f 69 6e 74 65 72 20 | 74 6f 20 69 74 0a 3b 20 |pointer |to it.; |
|00002500| 20 20 20 50 6f 69 6e 74 | 20 74 6f 20 53 74 72 69 |   Point| to Stri|
|00002510| 6e 67 20 75 73 69 6e 67 | 20 44 53 3a 44 58 2e 20 |ng using| DS:DX. |
|00002520| 20 52 45 54 55 52 4e 53 | 3a 20 20 41 58 20 63 6f | RETURNS|:  AX co|
|00002530| 6e 74 61 69 6e 73 20 6e | 75 6d 62 65 72 20 6f 66 |ntains n|umber of|
|00002540| 20 63 68 61 72 73 20 72 | 65 61 64 0a 3b 2d 2d 2d | chars r|ead.;---|
|00002550| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002560| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002570| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002580| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002590| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 0a 72 64 5f 73 74 |--------|--.rd_st|
|000025a0| 72 69 6e 67 09 70 72 6f | 63 09 6e 65 61 72 0a 0a |ring.pro|c.near..|
|000025b0| 09 09 70 75 73 68 09 62 | 78 0a 09 09 70 75 73 68 |..push.b|x...push|
|000025c0| 09 63 78 0a 09 09 70 75 | 73 68 09 64 69 0a 09 09 |.cx...pu|sh.di...|
|000025d0| 70 75 73 68 09 64 78 0a | 0a 09 09 6d 6f 76 09 64 |push.dx.|...mov.d|
|000025e0| 69 2c 64 78 09 09 3b 20 | 53 65 74 75 70 20 6f 75 |i,dx..; |Setup ou|
|000025f0| 72 20 62 75 66 66 65 72 | 20 70 6f 69 6e 74 65 72 |r buffer| pointer|
|00002600| 0a 09 09 6d 6f 76 09 62 | 78 2c 61 78 09 09 3b 20 |...mov.b|x,ax..; |
|00002610| 53 74 6f 72 65 20 74 68 | 65 20 6d 61 78 20 6c 65 |Store th|e max le|
|00002620| 6e 67 74 68 20 69 6e 20 | 42 58 0a 72 6e 65 78 74 |ngth in |BX.rnext|
|00002630| 5f 63 68 61 72 3a 0a 09 | 09 6d 6f 76 09 61 68 2c |_char:..|.mov.ah,|
|00002640| 30 68 09 09 3b 20 52 65 | 61 64 20 4b 65 79 62 6f |0h..; Re|ad Keybo|
|00002650| 61 72 64 20 43 68 61 72 | 61 63 74 65 72 20 46 75 |ard Char|acter Fu|
|00002660| 6e 63 74 69 6f 6e 0a 09 | 09 69 6e 74 09 4b 45 59 |nction..|.int.KEY|
|00002670| 42 4f 41 52 44 0a 09 09 | 63 6d 70 09 61 6c 2c 30 |BOARD...|cmp.al,0|
|00002680| 38 68 09 09 3b 20 42 61 | 63 6b 73 70 61 63 65 20 |8h..; Ba|ckspace |
|00002690| 3f 0a 09 09 6a 6e 65 09 | 63 68 65 63 6b 5f 65 6e |?...jne.|check_en|
|000026a0| 74 65 72 09 3b 20 4e 6f | 2c 20 73 6f 20 6a 75 6d |ter.; No|, so jum|
|000026b0| 70 0a 09 09 70 6f 70 09 | 64 78 09 09 3b 20 52 65 |p...pop.|dx..; Re|
|000026c0| 73 74 6f 72 65 20 74 68 | 65 20 68 65 61 64 20 6f |store th|e head o|
|000026d0| 66 20 62 75 66 66 65 72 | 20 70 6f 69 6e 74 65 72 |f buffer| pointer|
|000026e0| 0a 09 09 70 75 73 68 09 | 64 78 0a 09 09 63 6d 70 |...push.|dx...cmp|
|000026f0| 09 64 69 2c 64 78 09 09 | 3b 20 41 72 65 20 77 65 |.di,dx..|; Are we|
|00002700| 20 61 74 20 74 68 65 20 | 73 74 61 72 74 20 6f 66 | at the |start of|
|00002710| 20 6c 69 6e 65 3f 0a 09 | 09 6a 6c 65 09 72 6e 65 | line?..|.jle.rne|
|00002720| 78 74 5f 63 68 61 72 09 | 3b 20 59 65 73 2c 20 73 |xt_char.|; Yes, s|
|00002730| 6f 20 69 67 6e 6f 72 65 | 20 74 68 65 20 62 61 63 |o ignore| the bac|
|00002740| 6b 73 70 61 63 65 0a 0a | 09 09 64 65 63 09 64 69 |kspace..|..dec.di|
|00002750| 09 09 3b 20 44 65 63 72 | 65 6d 65 6e 74 20 6f 75 |..; Decr|ement ou|
|00002760| 72 20 62 75 66 66 65 72 | 20 70 6f 69 6e 74 65 72 |r buffer| pointer|
|00002770| 0a 09 09 6d 6f 76 09 61 | 6c 2c 30 09 09 3b 20 20 |...mov.a|l,0..;  |
|00002780| 61 6e 64 20 6d 6f 76 65 | 20 74 68 65 20 63 75 72 |and move| the cur|
|00002790| 73 6f 72 20 62 61 63 6b | 0a 09 09 63 61 6c 6c 09 |sor back|...call.|
|000027a0| 6d 6f 76 65 5f 63 75 72 | 73 6f 72 0a 0a 09 09 70 |move_cur|sor....p|
|000027b0| 75 73 68 09 62 78 09 09 | 3b 20 4e 6f 77 20 77 65 |ush.bx..|; Now we|
|000027c0| 20 68 61 76 65 20 74 6f | 20 65 72 61 73 65 20 74 | have to| erase t|
|000027d0| 68 65 20 63 68 61 72 61 | 63 74 65 72 0a 09 09 6d |he chara|cter...m|
|000027e0| 6f 76 09 62 68 2c 5b 64 | 69 73 70 6c 61 79 5f 70 |ov.bh,[d|isplay_p|
|000027f0| 61 67 65 5d 0a 09 09 6d | 6f 76 09 63 78 2c 31 0a |age]...m|ov.cx,1.|
|00002800| 09 09 6d 6f 76 09 62 6c | 2c 5b 73 63 72 5f 61 74 |..mov.bl|,[scr_at|
|00002810| 74 72 69 62 75 74 65 5d | 0a 09 09 6d 6f 76 09 61 |tribute]|...mov.a|
|00002820| 68 2c 30 39 68 09 09 3b | 20 46 75 6e 63 74 69 6f |h,09h..;| Functio|
|00002830| 6e 20 66 6f 72 20 77 72 | 69 74 69 6e 67 20 61 20 |n for wr|iting a |
|00002840| 63 68 61 72 61 63 74 65 | 72 0a 09 09 6d 6f 76 09 |characte|r...mov.|
|00002850| 61 6c 2c 32 30 68 09 09 | 3b 20 50 75 74 20 61 20 |al,20h..|; Put a |
|00002860| 73 70 61 63 65 20 6f 6e | 20 74 68 65 20 73 63 72 |space on| the scr|
|00002870| 65 65 6e 0a 09 09 69 6e | 74 09 56 49 44 45 4f 0a |een...in|t.VIDEO.|
|00002880| 09 09 70 6f 70 09 62 78 | 0a 09 09 6a 6d 70 09 73 |..pop.bx|...jmp.s|
|00002890| 68 6f 72 74 20 72 6e 65 | 78 74 5f 63 68 61 72 0a |hort rne|xt_char.|
|000028a0| 0a 63 68 65 63 6b 5f 65 | 6e 74 65 72 3a 09 09 0a |.check_e|nter:...|
|000028b0| 09 09 63 6d 70 09 61 6c | 2c 30 64 68 09 09 3b 20 |..cmp.al|,0dh..; |
|000028c0| 44 69 64 20 77 65 20 67 | 65 74 20 61 20 72 65 74 |Did we g|et a ret|
|000028d0| 75 72 6e 20 3f 0a 09 09 | 6a 6e 65 09 6c 65 74 74 |urn ?...|jne.lett|
|000028e0| 65 72 0a 09 09 6d 6f 76 | 09 62 79 74 65 20 70 74 |er...mov|.byte pt|
|000028f0| 72 20 5b 64 69 5d 2c 30 | 68 3b 20 41 6c 72 65 61 |r [di],0|h; Alrea|
|00002900| 64 79 20 61 74 20 65 6e | 64 20 6f 66 20 73 74 72 |dy at en|d of str|
|00002910| 69 6e 67 2c 20 73 6f 20 | 61 64 64 20 6e 75 6c 6c |ing, so |add null|
|00002920| 0a 09 09 70 6f 70 09 64 | 78 09 09 3b 20 52 65 73 |...pop.d|x..; Res|
|00002930| 74 6f 72 65 20 70 6f 69 | 6e 74 65 72 20 74 6f 20 |tore poi|nter to |
|00002940| 73 74 61 72 74 20 6f 66 | 20 62 75 66 66 65 72 0a |start of| buffer.|
|00002950| 09 09 73 75 62 09 64 69 | 2c 64 78 09 09 3b 20 48 |..sub.di|,dx..; H|
|00002960| 6f 77 20 6d 61 6e 79 20 | 63 68 61 72 73 20 64 69 |ow many |chars di|
|00002970| 64 20 77 65 20 72 65 61 | 64 20 3f 0a 09 09 6d 6f |d we rea|d ?...mo|
|00002980| 76 09 61 78 2c 64 69 09 | 09 3b 20 52 65 74 75 72 |v.ax,di.|.; Retur|
|00002990| 6e 20 74 68 61 74 20 6e | 75 6d 62 65 72 20 69 6e |n that n|umber in|
|000029a0| 20 41 58 0a 09 09 70 6f | 70 09 64 69 09 09 3b 20 | AX...po|p.di..; |
|000029b0| 52 65 73 74 6f 72 65 20 | 74 68 65 20 44 61 74 61 |Restore |the Data|
|000029c0| 20 49 6e 64 65 78 20 52 | 65 67 69 73 74 65 72 0a | Index R|egister.|
|000029d0| 09 09 70 6f 70 09 63 78 | 0a 09 09 70 6f 70 09 62 |..pop.cx|...pop.b|
|000029e0| 78 0a 09 09 72 65 74 09 | 09 0a 0a 6c 65 74 74 65 |x...ret.|...lette|
|000029f0| 72 3a 09 09 0a 09 09 63 | 6d 70 09 61 6c 2c 32 30 |r:.....c|mp.al,20|
|00002a00| 68 09 09 3b 20 43 68 65 | 63 6b 20 66 6f 72 20 61 |h..; Che|ck for a|
|00002a10| 20 76 61 6c 69 64 20 63 | 68 61 72 61 63 74 65 72 | valid c|haracter|
|00002a20| 0a 09 09 6a 6c 65 09 72 | 6e 65 78 74 5f 63 68 61 |...jle.r|next_cha|
|00002a30| 72 09 3b 20 49 67 6e 6f | 72 65 20 6e 6f 6e 65 20 |r.; Igno|re none |
|00002a40| 70 72 69 6e 74 61 62 6c | 65 20 63 68 61 72 61 63 |printabl|e charac|
|00002a50| 74 65 72 73 2f 6b 65 79 | 73 0a 09 09 63 6d 70 09 |ters/key|s...cmp.|
|00002a60| 61 6c 2c 37 65 68 0a 09 | 09 6a 67 09 72 6e 65 78 |al,7eh..|.jg.rnex|
|00002a70| 74 5f 63 68 61 72 0a 0a | 09 09 70 6f 70 09 64 78 |t_char..|..pop.dx|
|00002a80| 09 09 3b 20 52 65 73 74 | 6f 72 65 20 74 68 65 20 |..; Rest|ore the |
|00002a90| 68 65 61 64 20 6f 66 20 | 62 75 66 66 65 72 20 70 |head of |buffer p|
|00002aa0| 6f 69 6e 74 65 72 0a 09 | 09 70 75 73 68 09 64 78 |ointer..|.push.dx|
|00002ab0| 0a 09 09 61 64 64 09 64 | 78 2c 62 78 09 09 3b 20 |...add.d|x,bx..; |
|00002ac0| 4d 61 78 69 6d 75 6d 20 | 6f 66 20 22 62 78 22 20 |Maximum |of "bx" |
|00002ad0| 63 68 61 72 61 63 74 65 | 72 73 0a 09 09 63 6d 70 |characte|rs...cmp|
|00002ae0| 09 64 69 2c 64 78 09 09 | 3b 20 59 65 73 2c 20 73 |.di,dx..|; Yes, s|
|00002af0| 6f 20 61 72 65 20 77 65 | 20 61 74 20 74 68 65 20 |o are we| at the |
|00002b00| 65 6e 64 20 6f 66 20 62 | 75 66 66 65 72 3f 0a 09 |end of b|uffer?..|
|00002b10| 09 6a 6e 65 09 63 68 61 | 72 5f 6f 6b 0a 09 09 63 |.jne.cha|r_ok...c|
|00002b20| 61 6c 6c 09 72 69 6e 67 | 5f 62 65 6c 6c 09 3b 20 |all.ring|_bell.; |
|00002b30| 59 65 73 2c 20 73 6f 20 | 73 6f 75 6e 64 20 74 68 |Yes, so |sound th|
|00002b40| 65 20 61 6c 61 72 6d 0a | 09 09 6a 6d 70 09 72 6e |e alarm.|..jmp.rn|
|00002b50| 65 78 74 5f 63 68 61 72 | 0a 0a 63 68 61 72 5f 6f |ext_char|..char_o|
|00002b60| 6b 3a 0a 09 09 6d 6f 76 | 09 5b 64 69 5d 2c 61 6c |k:...mov|.[di],al|
|00002b70| 09 09 3b 20 53 74 6f 72 | 65 20 74 68 65 20 63 68 |..; Stor|e the ch|
|00002b80| 61 72 61 63 74 65 72 0a | 09 09 69 6e 63 09 64 69 |aracter.|..inc.di|
|00002b90| 09 09 3b 20 49 6e 63 72 | 65 6d 65 6e 74 20 6f 75 |..; Incr|ement ou|
|00002ba0| 72 20 70 6f 69 6e 74 65 | 72 0a 0a 09 09 70 75 73 |r pointe|r....pus|
|00002bb0| 68 09 62 78 0a 09 09 6d | 6f 76 09 63 78 2c 31 0a |h.bx...m|ov.cx,1.|
|00002bc0| 09 09 6d 6f 76 09 62 6c | 2c 5b 73 63 72 5f 61 74 |..mov.bl|,[scr_at|
|00002bd0| 74 72 69 62 75 74 65 5d | 0a 09 09 6d 6f 76 09 61 |tribute]|...mov.a|
|00002be0| 68 2c 30 39 68 09 09 3b | 20 44 69 73 70 6c 61 79 |h,09h..;| Display|
|00002bf0| 20 74 68 65 20 63 68 61 | 72 61 63 74 65 72 20 74 | the cha|racter t|
|00002c00| 6f 20 74 68 65 20 75 73 | 65 72 0a 09 09 6d 6f 76 |o the us|er...mov|
|00002c10| 09 62 68 2c 5b 64 69 73 | 70 6c 61 79 5f 70 61 67 |.bh,[dis|play_pag|
|00002c20| 65 5d 0a 09 09 69 6e 74 | 09 56 49 44 45 4f 0a 09 |e]...int|.VIDEO..|
|00002c30| 09 6d 6f 76 09 61 6c 2c | 31 09 09 3b 20 49 6e 63 |.mov.al,|1..; Inc|
|00002c40| 72 65 6d 65 6e 74 20 74 | 68 65 20 63 75 72 73 6f |rement t|he curso|
|00002c50| 72 0a 09 09 70 6f 70 09 | 62 78 0a 09 09 63 61 6c |r...pop.|bx...cal|
|00002c60| 6c 09 6d 6f 76 65 5f 63 | 75 72 73 6f 72 0a 09 09 |l.move_c|ursor...|
|00002c70| 6a 6d 70 09 72 6e 65 78 | 74 5f 63 68 61 72 09 3b |jmp.rnex|t_char.;|
|00002c80| 20 47 65 74 20 74 68 65 | 20 6e 65 78 74 20 63 68 | Get the| next ch|
|00002c90| 61 72 61 63 74 65 72 0a | 0a 72 64 5f 73 74 72 69 |aracter.|.rd_stri|
|00002ca0| 6e 67 09 65 6e 64 70 0a | 0a 0a 3b 2d 2d 2d 2d 2d |ng.endp.|..;-----|
|00002cb0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002cc0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002cd0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002ce0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002cf0| 2d 2d 2d 2d 2d 2d 2d 2d | 0a 3b 20 49 6e 63 72 65 |--------|.; Incre|
|00002d00| 6d 65 6e 74 20 6f 72 20 | 44 65 63 72 65 6d 65 6e |ment or |Decremen|
|00002d10| 74 20 74 68 65 20 63 75 | 72 72 65 6e 74 20 63 75 |t the cu|rrent cu|
|00002d20| 72 73 6f 72 20 70 6f 73 | 69 74 69 6f 6e 2e 20 20 |rsor pos|ition.  |
|00002d30| 41 58 3d 30 20 69 6d 70 | 6c 69 65 73 20 64 65 63 |AX=0 imp|lies dec|
|00002d40| 72 65 6d 65 6e 74 0a 3b | 2d 2d 2d 2d 2d 2d 2d 2d |rement.;|--------|
|00002d50| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002d60| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002d70| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002d80| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002d90| 2d 2d 2d 2d 2d 0a 6d 6f | 76 65 5f 63 75 72 73 6f |-----.mo|ve_curso|
|00002da0| 72 09 70 72 6f 63 09 6e | 65 61 72 0a 09 09 70 75 |r.proc.n|ear...pu|
|00002db0| 73 68 09 62 78 0a 09 09 | 70 75 73 68 09 63 78 0a |sh.bx...|push.cx.|
|00002dc0| 09 09 70 75 73 68 09 64 | 78 0a 0a 09 09 6d 6f 76 |..push.d|x....mov|
|00002dd0| 09 61 68 2c 30 33 68 09 | 09 3b 20 47 65 74 20 63 |.ah,03h.|.; Get c|
|00002de0| 75 72 73 6f 72 20 70 6f | 73 69 74 69 6f 6e 0a 09 |ursor po|sition..|
|00002df0| 09 6d 6f 76 09 62 68 2c | 5b 64 69 73 70 6c 61 79 |.mov.bh,|[display|
|00002e00| 5f 70 61 67 65 5d 0a 09 | 09 63 6d 70 09 61 6c 2c |_page]..|.cmp.al,|
|00002e10| 30 09 09 3b 20 49 66 20 | 63 6f 64 65 20 30 2c 20 |0..; If |code 0, |
|00002e20| 74 68 65 6e 20 64 65 63 | 72 65 6d 65 6e 74 20 63 |then dec|rement c|
|00002e30| 75 72 73 6f 72 0a 09 09 | 6a 65 09 64 65 63 5f 63 |ursor...|je.dec_c|
|00002e40| 75 72 73 6f 72 0a 09 09 | 69 6e 74 09 56 49 44 45 |ursor...|int.VIDE|
|00002e50| 4f 0a 09 09 69 6e 63 09 | 64 6c 0a 09 09 6a 6d 70 |O...inc.|dl...jmp|
|00002e60| 09 73 68 6f 72 74 20 6c | 61 73 74 5f 63 75 72 0a |.short l|ast_cur.|
|00002e70| 64 65 63 5f 63 75 72 73 | 6f 72 3a 0a 09 09 69 6e |dec_curs|or:...in|
|00002e80| 74 09 56 49 44 45 4f 0a | 09 09 64 65 63 09 64 6c |t.VIDEO.|..dec.dl|
|00002e90| 0a 6c 61 73 74 5f 63 75 | 72 3a 0a 09 09 6d 6f 76 |.last_cu|r:...mov|
|00002ea0| 09 61 68 2c 30 32 68 09 | 09 3b 20 53 65 74 20 74 |.ah,02h.|.; Set t|
|00002eb0| 68 65 20 43 75 72 73 6f | 72 20 50 6f 73 69 74 69 |he Curso|r Positi|
|00002ec0| 6f 6e 0a 09 09 69 6e 74 | 09 56 49 44 45 4f 0a 0a |on...int|.VIDEO..|
|00002ed0| 09 09 70 6f 70 09 64 78 | 0a 09 09 70 6f 70 09 63 |..pop.dx|...pop.c|
|00002ee0| 78 0a 09 09 70 6f 70 09 | 62 78 0a 09 09 72 65 74 |x...pop.|bx...ret|
|00002ef0| 0a 6d 6f 76 65 5f 63 75 | 72 73 6f 72 09 65 6e 64 |.move_cu|rsor.end|
|00002f00| 70 0a 0a 0a 3b 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |p...;---|--------|
|00002f10| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002f20| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002f30| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002f40| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 0a 3b 09 48 45 |--------|---.;.HE|
|00002f50| 58 32 20 2d 20 20 43 6f | 6e 76 65 72 74 20 74 68 |X2 -  Co|nvert th|
|00002f60| 65 20 41 4c 20 72 65 67 | 69 73 74 65 72 20 74 6f |e AL reg|ister to|
|00002f70| 20 68 65 78 69 64 65 63 | 69 6d 61 6c 20 64 69 67 | hexidec|imal dig|
|00002f80| 69 74 73 2e 0a 3b 09 09 | 54 68 65 20 63 68 61 72 |its..;..|The char|
|00002f90| 61 63 74 65 72 73 20 70 | 72 6f 64 75 63 65 64 20 |acters p|roduced |
|00002fa0| 61 72 65 20 73 74 6f 72 | 65 64 20 61 74 20 45 53 |are stor|ed at ES|
|00002fb0| 3a 44 49 2e 0a 3b 09 09 | 41 6c 6c 20 72 65 67 73 |:DI..;..|All regs|
|00002fc0| 20 70 72 65 73 65 72 76 | 65 64 2e 0a 3b 2d 2d 2d | preserv|ed..;---|
|00002fd0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002fe0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00002ff0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003000| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003010| 2d 2d 2d 0a 68 65 78 32 | 09 70 72 6f 63 09 6e 65 |---.hex2|.proc.ne|
|00003020| 61 72 0a 09 09 70 75 73 | 68 09 61 78 0a 09 09 70 |ar...pus|h.ax...p|
|00003030| 75 73 68 09 62 78 0a 09 | 09 70 75 73 68 09 63 78 |ush.bx..|.push.cx|
|00003040| 0a 0a 09 09 6d 6f 76 09 | 62 78 2c 61 78 0a 09 09 |....mov.|bx,ax...|
|00003050| 73 74 64 09 09 09 09 3b | 53 74 72 69 6e 67 20 70 |std....;|String p|
|00003060| 74 72 20 64 65 63 72 65 | 6d 65 6e 74 0a 09 09 61 |tr decre|ment...a|
|00003070| 64 64 09 64 69 2c 31 09 | 09 09 3b 50 6f 69 6e 74 |dd.di,1.|..;Point|
|00003080| 20 74 6f 20 65 6e 64 20 | 6f 66 20 73 74 72 69 6e | to end |of strin|
|00003090| 67 0a 09 09 6d 6f 76 09 | 63 78 2c 32 0a 68 31 30 |g...mov.|cx,2.h10|
|000030a0| 3a 0a 09 09 6d 6f 76 09 | 61 6c 2c 62 6c 09 09 09 |:...mov.|al,bl...|
|000030b0| 3b 57 61 6e 74 20 6c 6f | 77 65 72 20 68 61 6c 66 |;Want lo|wer half|
|000030c0| 0a 09 09 61 6e 64 09 61 | 6c 2c 30 66 68 09 09 09 |...and.a|l,0fh...|
|000030d0| 3b 20 6f 66 20 74 68 69 | 73 20 62 79 74 65 0a 09 |; of thi|s byte..|
|000030e0| 09 61 64 64 09 61 6c 2c | 39 30 68 09 09 09 3b 43 |.add.al,|90h...;C|
|000030f0| 6f 6e 76 65 72 74 20 41 | 4c 20 74 6f 20 41 53 43 |onvert A|L to ASC|
|00003100| 49 49 0a 09 09 64 61 61 | 0a 09 09 61 64 63 09 61 |II...daa|...adc.a|
|00003110| 6c 2c 34 30 68 0a 09 09 | 64 61 61 0a 09 09 73 74 |l,40h...|daa...st|
|00003120| 6f 73 62 09 09 09 09 3b | 53 74 6f 72 65 20 61 74 |osb....;|Store at|
|00003130| 20 45 53 3a 44 49 0a 09 | 09 73 68 72 09 62 78 2c | ES:DI..|.shr.bx,|
|00003140| 31 0a 09 09 73 68 72 09 | 62 78 2c 31 0a 09 09 73 |1...shr.|bx,1...s|
|00003150| 68 72 09 62 78 2c 31 0a | 09 09 73 68 72 09 62 78 |hr.bx,1.|..shr.bx|
|00003160| 2c 31 0a 09 09 6c 6f 6f | 70 09 68 31 30 0a 0a 09 |,1...loo|p.h10...|
|00003170| 09 70 6f 70 09 63 78 0a | 09 09 70 6f 70 09 62 78 |.pop.cx.|..pop.bx|
|00003180| 0a 09 09 70 6f 70 09 61 | 78 0a 09 09 69 6e 63 09 |...pop.a|x...inc.|
|00003190| 64 69 0a 09 09 63 6c 64 | 0a 09 09 72 65 74 0a 68 |di...cld|...ret.h|
|000031a0| 65 78 32 09 65 6e 64 70 | 0a 0a 0a 3b 2d 2d 2d 2d |ex2.endp|...;----|
|000031b0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000031c0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000031d0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000031e0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000031f0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 0a 3b 20 45 72 61 73 |--------|-.; Eras|
|00003200| 65 20 74 68 65 20 32 35 | 74 68 20 6c 69 6e 65 20 |e the 25|th line |
|00003210| 6f 66 20 74 68 65 20 73 | 63 72 65 65 6e 20 61 6e |of the s|creen an|
|00003220| 64 20 70 6f 73 69 74 69 | 6f 6e 20 74 68 65 20 63 |d positi|on the c|
|00003230| 75 72 73 6f 72 20 6f 6e | 20 74 68 61 74 20 6c 69 |ursor on| that li|
|00003240| 6e 65 0a 3b 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |ne.;----|--------|
|00003250| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003260| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003270| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003280| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003290| 2d 0a 63 6c 65 61 72 5f | 32 35 09 70 72 6f 63 09 |-.clear_|25.proc.|
|000032a0| 6e 65 61 72 0a 09 09 70 | 75 73 68 09 61 78 0a 09 |near...p|ush.ax..|
|000032b0| 09 70 75 73 68 09 64 78 | 0a 09 09 70 75 73 68 09 |.push.dx|...push.|
|000032c0| 63 78 0a 09 09 70 75 73 | 68 09 62 78 0a 0a 09 09 |cx...pus|h.bx....|
|000032d0| 6d 6f 76 09 61 68 2c 30 | 32 09 09 3b 20 53 65 74 |mov.ah,0|2..; Set|
|000032e0| 20 74 68 65 20 43 75 72 | 73 6f 72 20 50 6f 73 69 | the Cur|sor Posi|
|000032f0| 74 69 6f 6e 0a 09 09 6d | 6f 76 09 64 68 2c 32 34 |tion...m|ov.dh,24|
|00003300| 09 09 3b 20 47 6f 20 74 | 6f 20 74 68 65 20 32 35 |..; Go t|o the 25|
|00003310| 74 68 20 6c 69 6e 65 0a | 09 09 6d 6f 76 09 64 6c |th line.|..mov.dl|
|00003320| 2c 30 68 09 09 3b 20 63 | 6f 6c 75 6d 6e 20 6e 75 |,0h..; c|olumn nu|
|00003330| 6d 62 65 72 20 31 2e 0a | 09 09 69 6e 74 09 56 49 |mber 1..|..int.VI|
|00003340| 44 45 4f 0a 0a 09 09 6d | 6f 76 09 61 68 2c 30 39 |DEO....m|ov.ah,09|
|00003350| 68 09 09 3b 20 43 6c 65 | 61 72 20 74 68 65 20 6c |h..; Cle|ar the l|
|00003360| 69 6e 65 20 2e 2e 2e 0a | 09 09 6d 6f 76 09 61 6c |ine ....|..mov.al|
|00003370| 2c 32 30 68 09 09 3b 20 | 75 73 69 6e 67 20 73 70 |,20h..; |using sp|
|00003380| 61 63 65 73 0a 09 09 6d | 6f 76 09 62 68 2c 5b 64 |aces...m|ov.bh,[d|
|00003390| 69 73 70 6c 61 79 5f 70 | 61 67 65 5d 0a 09 09 6d |isplay_p|age]...m|
|000033a0| 6f 76 09 62 6c 2c 30 37 | 68 09 09 3b 20 43 68 61 |ov.bl,07|h..; Cha|
|000033b0| 6e 67 65 20 74 68 65 20 | 61 74 74 72 69 62 75 74 |nge the |attribut|
|000033c0| 65 73 20 74 6f 20 77 68 | 69 74 65 0a 09 09 6d 6f |es to wh|ite...mo|
|000033d0| 76 09 63 78 2c 38 30 09 | 09 3b 20 57 72 69 74 65 |v.cx,80.|.; Write|
|000033e0| 20 38 30 20 63 68 61 72 | 61 63 74 65 72 73 0a 09 | 80 char|acters..|
|000033f0| 09 69 6e 74 09 56 49 44 | 45 4f 0a 0a 09 09 70 6f |.int.VID|EO....po|
|00003400| 70 09 62 78 0a 09 09 70 | 6f 70 09 63 78 0a 09 09 |p.bx...p|op.cx...|
|00003410| 70 6f 70 09 64 78 0a 09 | 09 70 6f 70 09 61 78 0a |pop.dx..|.pop.ax.|
|00003420| 09 09 72 65 74 0a 63 6c | 65 61 72 5f 32 35 09 65 |..ret.cl|ear_25.e|
|00003430| 6e 64 70 0a 0a 0a 3b 2d | 2d 2d 2d 2d 2d 2d 2d 2d |ndp...;-|--------|
|00003440| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003450| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003460| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003470| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003480| 2d 2d 2d 2d 0a 3b 20 20 | 50 61 75 73 65 20 73 6f |----.;  |Pause so|
|00003490| 20 74 68 65 20 75 73 65 | 72 20 63 61 6e 20 70 72 | the use|r can pr|
|000034a0| 65 73 73 20 61 20 6b 65 | 79 20 2e 2e 2e 20 61 6e |ess a ke|y ... an|
|000034b0| 79 20 6b 65 79 20 2e 2e | 2e 0a 3b 2d 2d 2d 2d 2d |y key ..|..;-----|
|000034c0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000034d0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000034e0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000034f0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003500| 2d 2d 2d 2d 2d 2d 2d 2d | 0a 70 61 75 73 65 09 70 |--------|.pause.p|
|00003510| 72 6f 63 09 6e 65 61 72 | 0a 09 6d 6f 76 09 73 69 |roc.near|..mov.si|
|00003520| 2c 20 6f 66 66 73 65 74 | 20 70 61 75 73 65 5f 6d |, offset| pause_m|
|00003530| 73 67 0a 09 63 61 6c 6c | 09 77 72 5f 73 74 72 69 |sg..call|.wr_stri|
|00003540| 6e 67 0a 0a 74 6f 70 5f | 70 61 75 73 65 3a 0a 09 |ng..top_|pause:..|
|00003550| 6d 6f 76 09 61 68 2c 30 | 31 68 09 09 09 3b 20 57 |mov.ah,0|1h...; W|
|00003560| 61 69 74 20 66 6f 72 20 | 61 20 6b 65 79 20 74 6f |ait for |a key to|
|00003570| 20 62 65 20 70 72 65 73 | 73 65 64 0a 09 69 6e 74 | be pres|sed..int|
|00003580| 09 4b 45 59 42 4f 41 52 | 44 0a 09 6a 7a 09 74 6f |.KEYBOAR|D..jz.to|
|00003590| 70 5f 70 61 75 73 65 0a | 09 6d 6f 76 09 61 68 2c |p_pause.|.mov.ah,|
|000035a0| 30 30 68 09 09 09 3b 20 | 45 61 74 20 74 68 65 20 |00h...; |Eat the |
|000035b0| 6b 65 79 73 74 72 6f 6b | 65 0a 09 69 6e 74 09 4b |keystrok|e..int.K|
|000035c0| 45 59 42 4f 41 52 44 09 | 0a 0a 3b 09 63 6d 70 09 |EYBOARD.|..;.cmp.|
|000035d0| 61 6c 2c 30 64 68 09 09 | 09 3b 20 4f 6e 6c 79 20 |al,0dh..|.; Only |
|000035e0| 63 6f 6e 74 69 6e 75 65 | 20 77 69 74 68 20 74 68 |continue| with th|
|000035f0| 65 20 5b 52 45 54 55 52 | 4e 5d 20 6b 65 79 0a 3b |e [RETUR|N] key.;|
|00003600| 09 6a 6e 65 09 74 6f 70 | 5f 70 61 75 73 65 0a 0a |.jne.top|_pause..|
|00003610| 09 72 65 74 0a 70 61 75 | 73 65 09 65 6e 64 70 0a |.ret.pau|se.endp.|
|00003620| 0a 0a 3b 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |..;-----|--------|
|00003630| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003640| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003650| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003660| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003670| 0a 3b 20 44 69 73 70 6c | 61 79 20 74 68 65 20 45 |.; Displ|ay the E|
|00003680| 72 72 6f 72 20 43 6f 64 | 65 20 61 6e 64 20 4d 65 |rror Cod|e and Me|
|00003690| 73 73 61 67 65 0a 3b 2d | 2d 2d 2d 2d 2d 2d 2d 2d |ssage.;-|--------|
|000036a0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000036b0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000036c0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000036d0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|000036e0| 2d 2d 2d 2d 0a 64 69 73 | 70 6c 61 79 5f 65 72 72 |----.dis|play_err|
|000036f0| 6d 73 67 09 70 72 6f 63 | 09 6e 65 61 72 0a 09 63 |msg.proc|.near..c|
|00003700| 61 6c 6c 09 63 6c 65 61 | 72 5f 32 35 0a 09 63 61 |all.clea|r_25..ca|
|00003710| 6c 6c 09 72 69 6e 67 5f | 62 65 6c 6c 0a 09 6d 6f |ll.ring_|bell..mo|
|00003720| 76 09 64 69 2c 6f 66 66 | 73 65 74 20 65 72 72 63 |v.di,off|set errc|
|00003730| 6f 64 65 09 3b 20 44 69 | 73 70 6c 61 79 20 74 68 |ode.; Di|splay th|
|00003740| 65 20 65 72 72 6f 72 20 | 63 6f 64 65 0a 09 63 61 |e error |code..ca|
|00003750| 6c 6c 09 68 65 78 32 0a | 09 6c 65 61 09 73 69 2c |ll.hex2.|.lea.si,|
|00003760| 20 65 72 72 6d 73 67 0a | 09 63 61 6c 6c 09 77 72 | errmsg.|.call.wr|
|00003770| 5f 73 74 72 69 6e 67 0a | 09 63 6d 70 09 61 6c 2c |_string.|.cmp.al,|
|00003780| 30 66 68 09 09 09 3b 20 | 49 73 20 74 68 65 20 65 |0fh...; |Is the e|
|00003790| 72 72 6f 72 20 6f 66 66 | 20 74 68 65 20 73 63 61 |rror off| the sca|
|000037a0| 6c 65 20 3f 3f 0a 09 6a | 6c 65 09 74 61 62 6c 65 |le ??..j|le.table|
|000037b0| 0a 09 6c 65 61 09 73 69 | 2c 65 5f 75 6e 6b 6e 6f |..lea.si|,e_unkno|
|000037c0| 77 6e 09 09 3b 20 59 65 | 73 2c 20 73 6f 20 64 69 |wn..; Ye|s, so di|
|000037d0| 73 70 6c 61 79 20 22 75 | 6e 6b 6e 6f 77 6e 22 20 |splay "u|nknown" |
|000037e0| 6d 65 73 73 61 67 65 0a | 09 6a 6d 70 09 73 68 6f |message.|.jmp.sho|
|000037f0| 72 74 20 73 68 6f 77 5f | 65 72 72 6f 72 0a 0a 74 |rt show_|error..t|
|00003800| 61 62 6c 65 3a 0a 09 78 | 6f 72 09 62 68 2c 62 68 |able:..x|or.bh,bh|
|00003810| 09 09 09 3b 20 42 75 69 | 6c 64 20 6f 66 66 73 65 |...; Bui|ld offse|
|00003820| 74 20 69 6e 74 6f 20 65 | 72 72 6f 72 20 74 61 62 |t into e|rror tab|
|00003830| 6c 65 0a 09 6d 6f 76 09 | 62 6c 2c 61 6c 09 09 09 |le..mov.|bl,al...|
|00003840| 3b 20 43 61 6e 27 74 20 | 75 73 65 20 41 58 20 61 |; Can't |use AX a|
|00003850| 73 20 61 20 6d 65 6d 6f | 72 79 20 69 6e 64 65 78 |s a memo|ry index|
|00003860| 20 70 74 72 0a 09 64 65 | 63 09 62 78 09 09 09 3b | ptr..de|c.bx...;|
|00003870| 20 54 61 62 6c 65 20 69 | 73 20 62 61 73 65 20 30 | Table i|s base 0|
|00003880| 2c 20 73 6f 20 72 65 64 | 75 63 65 20 74 68 65 20 |, so red|uce the |
|00003890| 69 6e 64 65 78 0a 09 73 | 68 6c 09 62 78 2c 31 09 |index..s|hl.bx,1.|
|000038a0| 09 09 3b 20 4d 61 6b 65 | 20 6f 66 66 73 65 74 20 |..; Make| offset |
|000038b0| 69 6e 74 6f 20 74 61 62 | 6c 65 20 28 2a 32 29 0a |into tab|le (*2).|
|000038c0| 09 6d 6f 76 09 73 69 2c | 65 72 72 5f 74 61 62 6c |.mov.si,|err_tabl|
|000038d0| 65 5b 62 78 5d 0a 0a 73 | 68 6f 77 5f 65 72 72 6f |e[bx]..s|how_erro|
|000038e0| 72 3a 0a 09 63 61 6c 6c | 09 77 72 5f 73 74 72 69 |r:..call|.wr_stri|
|000038f0| 6e 67 09 09 3b 20 4e 6f | 77 20 64 69 73 70 6c 61 |ng..; No|w displa|
|00003900| 79 20 74 68 65 20 65 72 | 72 6f 72 0a 09 63 61 6c |y the er|ror..cal|
|00003910| 6c 09 70 61 75 73 65 0a | 09 72 65 74 0a 64 69 73 |l.pause.|.ret.dis|
|00003920| 70 6c 61 79 5f 65 72 72 | 6d 73 67 09 65 6e 64 70 |play_err|msg.endp|
|00003930| 0a 0a 0a 3b 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |...;----|--------|
|00003940| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003950| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003960| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003970| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003980| 2d 0a 3b 20 52 69 6e 67 | 20 74 68 65 20 42 65 6c |-.; Ring| the Bel|
|00003990| 6c 20 74 6f 20 69 6e 64 | 69 63 61 74 65 20 74 68 |l to ind|icate th|
|000039a0| 61 74 20 61 6e 20 65 72 | 72 6f 72 20 6f 63 63 75 |at an er|ror occu|
|000039b0| 72 65 64 20 2d 20 77 65 | 20 63 72 65 61 74 65 20 |red - we| create |
|000039c0| 61 20 73 70 65 63 69 61 | 6c 20 74 6f 6e 65 0a 3b |a specia|l tone.;|
|000039d0| 20 20 20 20 20 20 20 20 | 20 20 20 20 20 20 20 73 |        |       s|
|000039e0| 6f 20 74 68 61 74 20 74 | 68 65 20 75 73 65 72 20 |o that t|he user |
|000039f0| 6b 6e 6f 77 73 20 69 74 | 20 69 73 20 4e 50 52 49 |knows it| is NPRI|
|00003a00| 4e 54 20 74 68 61 74 20 | 64 69 64 20 69 74 2e 0a |NT that |did it..|
|00003a10| 3b 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |;-------|--------|
|00003a20| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003a30| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003a40| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003a50| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 0a 72 |--------|------.r|
|00003a60| 69 6e 67 5f 62 65 6c 6c | 09 70 72 6f 63 09 6e 65 |ing_bell|.proc.ne|
|00003a70| 61 72 0a 09 09 70 75 73 | 68 09 61 78 0a 09 09 70 |ar...pus|h.ax...p|
|00003a80| 75 73 68 09 63 78 0a 09 | 09 70 75 73 68 09 64 78 |ush.cx..|.push.dx|
|00003a90| 0a 0a 09 09 69 6e 09 61 | 6c 2c 36 31 68 09 09 3b |....in.a|l,61h..;|
|00003aa0| 20 47 65 74 20 70 6f 72 | 74 20 64 61 74 61 0a 09 | Get por|t data..|
|00003ab0| 09 70 75 73 68 09 61 78 | 09 09 3b 20 20 20 61 6e |.push.ax|..;   an|
|00003ac0| 64 20 73 61 76 65 20 69 | 74 0a 09 09 63 6c 69 09 |d save i|t...cli.|
|00003ad0| 09 09 3b 20 43 6c 65 61 | 72 20 49 6e 74 65 72 72 |..; Clea|r Interr|
|00003ae0| 75 70 74 73 0a 0a 09 09 | 6d 6f 76 09 64 78 2c 30 |upts....|mov.dx,0|
|00003af0| 63 68 09 09 3b 20 4c 65 | 6e 67 74 68 20 6f 66 20 |ch..; Le|ngth of |
|00003b00| 62 65 6c 6c 20 74 6f 6e | 65 0a 09 09 6d 6f 76 09 |bell ton|e...mov.|
|00003b10| 5b 74 6f 6e 65 5d 2c 35 | 30 30 68 09 3b 20 46 72 |[tone],5|00h.; Fr|
|00003b20| 65 71 75 65 6e 63 79 0a | 09 09 63 61 6c 6c 09 73 |equency.|..call.s|
|00003b30| 70 65 61 6b 65 72 0a 0a | 09 09 6d 6f 76 09 64 78 |peaker..|..mov.dx|
|00003b40| 2c 30 63 68 09 09 3b 20 | 4c 65 6e 67 74 68 20 6f |,0ch..; |Length o|
|00003b50| 66 20 62 65 6c 6c 20 74 | 6f 6e 65 0a 09 09 6d 6f |f bell t|one...mo|
|00003b60| 76 09 5b 74 6f 6e 65 5d | 2c 31 30 30 30 68 09 3b |v.[tone]|,1000h.;|
|00003b70| 20 46 72 65 71 75 65 6e | 63 79 0a 09 09 63 61 6c | Frequen|cy...cal|
|00003b80| 6c 09 73 70 65 61 6b 65 | 72 0a 0a 09 09 70 6f 70 |l.speake|r....pop|
|00003b90| 09 61 78 09 09 3b 20 52 | 65 73 65 74 0a 09 09 6f |.ax..; R|eset...o|
|00003ba0| 75 74 09 36 31 68 2c 61 | 6c 09 09 3b 20 20 20 70 |ut.61h,a|l..;   p|
|00003bb0| 6f 72 74 20 64 61 74 61 | 0a 09 09 73 74 69 09 09 |ort data|...sti..|
|00003bc0| 09 3b 20 52 65 73 65 74 | 20 49 6e 74 65 72 72 75 |.; Reset| Interru|
|00003bd0| 70 74 73 0a 0a 09 09 70 | 6f 70 09 64 78 0a 09 09 |pts....p|op.dx...|
|00003be0| 70 6f 70 09 63 78 0a 09 | 09 70 6f 70 09 61 78 0a |pop.cx..|.pop.ax.|
|00003bf0| 09 09 72 65 74 0a 72 69 | 6e 67 5f 62 65 6c 6c 09 |..ret.ri|ng_bell.|
|00003c00| 65 6e 64 70 0a 0a 09 09 | 0a 3b 2d 2d 2d 2d 2d 2d |endp....|.;------|
|00003c10| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003c20| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003c30| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003c40| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003c50| 2d 2d 2d 2d 2d 2d 2d 0a | 3b 20 41 63 74 69 76 61 |-------.|; Activa|
|00003c60| 74 65 20 74 68 65 20 73 | 70 65 61 6b 65 72 20 66 |te the s|peaker f|
|00003c70| 6f 72 20 61 20 73 70 65 | 63 69 66 69 65 64 20 74 |or a spe|cified t|
|00003c80| 69 6d 65 20 61 6e 64 20 | 74 6f 6e 65 2e 0a 3b 2d |ime and |tone..;-|
|00003c90| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003ca0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003cb0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003cc0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003cd0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 0a 73 70 65 |--------|----.spe|
|00003ce0| 61 6b 65 72 09 09 70 72 | 6f 63 09 6e 65 61 72 0a |aker..pr|oc.near.|
|00003cf0| 42 45 4c 4c 33 30 3a 0a | 09 09 61 6e 64 09 61 6c |BELL30:.|..and.al|
|00003d00| 2c 31 31 31 31 31 31 30 | 30 42 09 3b 20 53 65 74 |,1111110|0B.; Set|
|00003d10| 20 62 69 74 73 20 30 20 | 26 20 31 20 6f 66 66 0a | bits 0 |& 1 off.|
|00003d20| 09 09 6f 75 74 09 36 31 | 68 2c 61 6c 09 09 3b 20 |..out.61|h,al..; |
|00003d30| 54 72 61 6e 73 6d 69 74 | 20 74 6f 20 73 70 65 61 |Transmit| to spea|
|00003d40| 6b 65 72 0a 09 09 6d 6f | 76 09 63 78 2c 5b 74 6f |ker...mo|v.cx,[to|
|00003d50| 6e 65 5d 09 3b 20 53 65 | 74 20 74 68 65 20 6c 65 |ne].; Se|t the le|
|00003d60| 6e 67 74 68 0a 42 45 4c | 4c 34 30 3a 0a 09 09 6c |ngth.BEL|L40:...l|
|00003d70| 6f 6f 70 09 42 45 4c 4c | 34 30 09 09 3b 20 54 69 |oop.BELL|40..; Ti|
|00003d80| 6d 65 20 44 65 6c 61 79 | 0a 09 09 6f 72 09 61 6c |me Delay|...or.al|
|00003d90| 2c 30 30 30 30 30 30 31 | 30 42 09 3b 20 53 65 74 |,0000001|0B.; Set|
|00003da0| 20 62 69 74 20 31 20 6f | 6e 0a 09 09 6f 75 74 09 | bit 1 o|n...out.|
|00003db0| 36 31 68 2c 61 6c 09 09 | 3b 20 54 72 61 6e 73 6d |61h,al..|; Transm|
|00003dc0| 69 74 20 74 6f 20 73 70 | 65 61 6b 65 72 0a 09 09 |it to sp|eaker...|
|00003dd0| 6d 6f 76 09 63 78 2c 5b | 74 6f 6e 65 5d 09 3b 20 |mov.cx,[|tone].; |
|00003de0| 53 65 74 20 6c 65 6e 67 | 74 68 0a 42 45 4c 4c 35 |Set leng|th.BELL5|
|00003df0| 30 3a 0a 09 09 6c 6f 6f | 70 09 42 45 4c 4c 35 30 |0:...loo|p.BELL50|
|00003e00| 09 09 3b 20 54 69 6d 65 | 20 44 65 6c 61 79 0a 09 |..; Time| Delay..|
|00003e10| 09 64 65 63 09 64 78 09 | 09 3b 20 52 65 64 75 63 |.dec.dx.|.; Reduc|
|00003e20| 65 20 44 75 72 61 74 69 | 6f 6e 0a 09 09 6a 6e 7a |e Durati|on...jnz|
|00003e30| 09 42 45 4c 4c 33 30 09 | 09 3b 20 43 6f 6e 74 69 |.BELL30.|.; Conti|
|00003e40| 6e 75 65 20 3f 0a 09 09 | 72 65 74 09 09 09 3b 20 |nue ?...|ret...; |
|00003e50| 4e 6f 70 65 2c 20 77 65 | 20 61 72 65 20 61 6c 6c |Nope, we| are all|
|00003e60| 20 64 6f 6e 65 2e 0a 73 | 70 65 61 6b 65 72 09 09 | done..s|peaker..|
|00003e70| 65 6e 64 70 0a 0a 0a 66 | 69 6c 65 6e 61 6d 65 09 |endp...f|ilename.|
|00003e80| 64 62 09 36 31 20 44 55 | 50 20 28 3f 29 09 3b 20 |db.61 DU|P (?).; |
|00003e90| 53 74 6f 72 61 67 65 20 | 66 6f 72 20 75 73 65 72 |Storage |for user|
|00003ea0| 20 69 6e 70 75 74 74 65 | 64 20 66 69 6c 65 6e 61 | inputte|d filena|
|00003eb0| 6d 65 0a 73 63 72 65 65 | 6e 62 75 66 09 64 62 09 |me.scree|nbuf.db.|
|00003ec0| 38 30 2a 32 20 44 55 50 | 20 28 3f 29 09 3b 20 53 |80*2 DUP| (?).; S|
|00003ed0| 74 6f 72 61 67 65 20 66 | 6f 72 20 73 63 72 65 65 |torage f|or scree|
|00003ee0| 6e 20 6c 69 6e 65 20 77 | 65 20 63 6c 65 61 72 0a |n line w|e clear.|
|00003ef0| 6c 61 73 74 62 79 74 65 | 20 3d 20 24 0a 0a 0a 3b |lastbyte| = $...;|
|00003f00| 20 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d | -------|--------|
|00003f10| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003f20| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003f30| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003f40| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 0a 3b 20 20 |--------|----.;  |
|00003f50| 4d 61 69 6e 20 72 6f 75 | 74 69 6e 65 20 74 6f 20 |Main rou|tine to |
|00003f60| 69 6e 73 74 61 6c 6c 20 | 4e 50 52 49 4e 54 20 61 |install |NPRINT a|
|00003f70| 73 20 61 20 54 53 52 0a | 3b 20 2d 2d 2d 2d 2d 2d |s a TSR.|; ------|
|00003f80| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003f90| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003fa0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003fb0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00003fc0| 2d 2d 2d 2d 2d 0a 0a 69 | 6e 73 74 61 6c 6c 09 70 |-----..i|nstall.p|
|00003fd0| 72 6f 63 09 6e 65 61 72 | 0a 09 61 73 73 75 6d 65 |roc.near|..assume|
|00003fe0| 09 63 73 3a 63 73 65 67 | 2c 64 73 3a 63 73 65 67 |.cs:cseg|,ds:cseg|
|00003ff0| 2c 65 73 3a 63 73 65 67 | 2c 73 73 3a 63 73 65 67 |,es:cseg|,ss:cseg|
|00004000| 0a 0a 09 6c 65 61 09 64 | 78 2c 63 6f 70 79 72 69 |...lea.d|x,copyri|
|00004010| 67 68 74 0a 09 6d 6f 76 | 09 61 68 2c 30 39 68 09 |ght..mov|.ah,09h.|
|00004020| 09 3b 20 50 72 69 6e 74 | 20 61 20 63 6f 70 79 72 |.; Print| a copyr|
|00004030| 69 67 68 74 20 6d 65 73 | 73 61 67 65 0a 09 69 6e |ight mes|sage..in|
|00004040| 74 09 44 4f 53 0a 0a 09 | 6d 6f 76 09 61 68 2c 30 |t.DOS...|mov.ah,0|
|00004050| 31 68 09 09 3b 20 50 52 | 49 4e 54 20 46 75 6e 63 |1h..; PR|INT Func|
|00004060| 74 69 6f 6e 0a 09 6d 6f | 76 09 61 6c 2c 30 30 68 |tion..mo|v.al,00h|
|00004070| 09 09 3b 20 50 72 69 6e | 74 20 49 6e 73 74 61 6c |..; Prin|t Instal|
|00004080| 6c 61 74 69 6f 6e 20 43 | 68 65 63 6b 20 53 75 62 |lation C|heck Sub|
|00004090| 66 75 6e 63 74 69 6f 6e | 0a 09 69 6e 74 09 4d 55 |function|..int.MU|
|000040a0| 4c 54 49 50 4c 45 58 09 | 3b 20 4d 75 6c 74 69 70 |LTIPLEX.|; Multip|
|000040b0| 6c 65 78 20 53 65 72 76 | 69 63 65 20 49 6e 74 65 |lex Serv|ice Inte|
|000040c0| 72 72 75 70 74 0a 09 63 | 6d 70 09 61 6c 2c 30 46 |rrupt..c|mp.al,0F|
|000040d0| 46 68 0a 09 6a 65 09 6f | 6b 32 69 6e 73 74 09 09 |Fh..je.o|k2inst..|
|000040e0| 3b 20 49 66 20 77 65 20 | 67 65 74 20 46 46 68 20 |; If we |get FFh |
|000040f0| 72 65 74 75 72 6e 65 64 | 2c 20 74 68 65 6e 20 50 |returned|, then P|
|00004100| 52 49 4e 54 20 69 73 20 | 74 68 65 72 65 2e 0a 09 |RINT is |there...|
|00004110| 6c 65 61 09 64 78 2c 6e | 6f 70 72 69 6e 74 0a 09 |lea.dx,n|oprint..|
|00004120| 6d 6f 76 09 61 68 2c 30 | 39 68 09 09 3b 20 50 72 |mov.ah,0|9h..; Pr|
|00004130| 69 6e 74 20 61 20 66 61 | 69 6c 69 6e 67 20 6d 65 |int a fa|iling me|
|00004140| 73 73 61 67 65 0a 09 69 | 6e 74 09 44 4f 53 0a 09 |ssage..i|nt.DOS..|
|00004150| 6d 6f 76 09 61 78 2c 34 | 63 30 31 68 09 3b 20 54 |mov.ax,4|c01h.; T|
|00004160| 65 72 6d 69 6e 61 74 65 | 20 77 69 74 68 20 65 72 |erminate| with er|
|00004170| 72 6f 72 20 63 6f 64 65 | 20 31 0a 09 69 6e 74 09 |ror code| 1..int.|
|00004180| 44 4f 53 0a 0a 6f 6b 32 | 69 6e 73 74 3a 0a 49 46 |DOS..ok2|inst:.IF|
|00004190| 44 45 46 20 44 45 42 55 | 47 0a 09 63 61 6c 6c 09 |DEF DEBU|G..call.|
|000041a0| 6d 61 69 6e 0a 45 4e 44 | 49 46 0a 0a 09 6d 6f 76 |main.END|IF...mov|
|000041b0| 09 61 68 2c 33 35 68 09 | 09 3b 20 44 65 74 65 72 |.ah,35h.|.; Deter|
|000041c0| 6d 69 6e 65 20 49 6e 74 | 65 72 72 75 70 74 20 76 |mine Int|errupt v|
|000041d0| 65 63 74 6f 72 20 66 6f | 72 20 50 72 69 6e 74 53 |ector fo|r PrintS|
|000041e0| 63 72 65 65 6e 0a 09 6d | 6f 76 09 61 6c 2c 30 35 |creen..m|ov.al,05|
|000041f0| 68 0a 09 69 6e 74 09 44 | 4f 53 0a 09 6d 6f 76 09 |h..int.D|OS..mov.|
|00004200| 77 6f 72 64 20 70 74 72 | 20 6f 6c 64 5f 69 6e 74 |word ptr| old_int|
|00004210| 5f 35 5b 30 5d 2c 62 78 | 09 3b 6f 66 66 73 65 74 |_5[0],bx|.;offset|
|00004220| 0a 09 6d 6f 76 09 77 6f | 72 64 20 70 74 72 20 6f |..mov.wo|rd ptr o|
|00004230| 6c 64 5f 69 6e 74 5f 35 | 5b 32 5d 2c 65 73 09 3b |ld_int_5|[2],es.;|
|00004240| 73 65 67 6d 65 6e 74 0a | 0a 09 6d 6f 76 09 61 68 |segment.|..mov.ah|
|00004250| 2c 33 35 68 09 09 3b 20 | 44 65 74 65 72 6d 69 6e |,35h..; |Determin|
|00004260| 65 20 49 6e 74 65 72 72 | 75 70 74 20 76 65 63 74 |e Interr|upt vect|
|00004270| 6f 72 20 66 6f 72 20 44 | 4f 53 20 63 61 6c 6c 0a |or for D|OS call.|
|00004280| 09 6d 6f 76 09 61 6c 2c | 32 38 68 0a 09 69 6e 74 |.mov.al,|28h..int|
|00004290| 09 44 4f 53 0a 09 6d 6f | 76 09 77 6f 72 64 20 70 |.DOS..mo|v.word p|
|000042a0| 74 72 20 6f 6c 64 5f 69 | 6e 74 5f 32 38 5b 30 5d |tr old_i|nt_28[0]|
|000042b0| 2c 62 78 09 3b 6f 66 66 | 73 65 74 0a 09 6d 6f 76 |,bx.;off|set..mov|
|000042c0| 09 77 6f 72 64 20 70 74 | 72 20 6f 6c 64 5f 69 6e |.word pt|r old_in|
|000042d0| 74 5f 32 38 5b 32 5d 2c | 65 73 09 3b 73 65 67 6d |t_28[2],|es.;segm|
|000042e0| 65 6e 74 0a 0a 09 6c 65 | 61 09 73 69 2c 63 6f 70 |ent...le|a.si,cop|
|000042f0| 79 72 69 67 68 74 09 3b | 20 4c 65 74 73 20 73 65 |yright.;| Lets se|
|00004300| 65 20 69 66 20 77 65 20 | 61 72 65 20 61 6c 72 65 |e if we |are alre|
|00004310| 61 64 79 20 69 6e 73 74 | 61 6c 6c 65 64 2e 0a 09 |ady inst|alled...|
|00004320| 6d 6f 76 09 64 69 2c 62 | 78 09 09 3b 20 50 75 74 |mov.di,b|x..; Put|
|00004330| 20 74 68 65 20 6f 66 66 | 73 65 74 20 69 6e 74 6f | the off|set into|
|00004340| 20 74 68 65 20 44 49 20 | 72 65 67 69 73 74 65 72 | the DI |register|
|00004350| 0a 09 73 75 62 09 64 69 | 2c 64 61 74 61 73 69 7a |..sub.di|,datasiz|
|00004360| 65 09 3b 20 50 6f 73 69 | 74 69 6f 6e 20 6f 75 72 |e.; Posi|tion our|
|00004370| 73 65 6c 76 65 73 20 74 | 6f 20 74 68 65 20 73 74 |selves t|o the st|
|00004380| 61 72 74 20 6f 66 20 74 | 68 65 20 64 61 74 61 0a |art of t|he data.|
|00004390| 09 6d 6f 76 09 63 78 2c | 36 09 09 3b 20 43 6f 6d |.mov.cx,|6..; Com|
|000043a0| 70 61 72 65 20 36 20 62 | 79 74 65 73 20 28 4e 50 |pare 6 b|ytes (NP|
|000043b0| 52 49 4e 54 29 0a 09 72 | 65 70 65 09 63 6d 70 73 |RINT)..r|epe.cmps|
|000043c0| 62 09 09 3b 20 52 65 70 | 65 61 74 20 61 73 20 6c |b..; Rep|eat as l|
|000043d0| 6f 6e 67 20 61 73 20 74 | 68 65 79 20 6d 61 74 63 |ong as t|hey matc|
|000043e0| 68 0a 09 6a 6e 65 09 6e | 6f 74 5f 69 6e 73 74 61 |h..jne.n|ot_insta|
|000043f0| 6c 6c 65 64 09 3b 20 49 | 66 20 69 74 20 64 6f 65 |lled.; I|f it doe|
|00004400| 73 6e 27 74 20 6d 61 74 | 63 68 2c 20 74 68 65 6e |sn't mat|ch, then|
|00004410| 20 77 65 20 61 72 65 6e | 27 74 20 69 6e 73 74 61 | we aren|'t insta|
|00004420| 6c 6c 65 64 0a 09 6c 65 | 61 09 64 78 2c 69 6e 73 |lled..le|a.dx,ins|
|00004430| 74 5f 65 72 72 09 3b 20 | 4f 4f 50 53 2c 20 74 68 |t_err.; |OOPS, th|
|00004440| 65 79 20 6d 61 74 63 68 | 2e 20 20 54 65 6c 6c 20 |ey match|.  Tell |
|00004450| 74 68 65 20 75 73 65 72 | 20 61 62 6f 75 74 20 69 |the user| about i|
|00004460| 74 2e 0a 09 6d 6f 76 09 | 61 68 2c 30 39 68 0a 09 |t...mov.|ah,09h..|
|00004470| 69 6e 74 09 44 4f 53 0a | 09 6d 6f 76 09 61 78 2c |int.DOS.|.mov.ax,|
|00004480| 34 63 30 32 68 09 3b 20 | 52 65 74 75 72 6e 20 74 |4c02h.; |Return t|
|00004490| 6f 20 44 4f 53 20 77 69 | 74 68 20 65 72 72 6f 72 |o DOS wi|th error|
|000044a0| 6c 65 76 65 6c 20 32 0a | 09 69 6e 74 09 44 4f 53 |level 2.|.int.DOS|
|000044b0| 0a 0a 6e 6f 74 5f 69 6e | 73 74 61 6c 6c 65 64 3a |..not_in|stalled:|
|000044c0| 0a 09 6d 6f 76 09 61 68 | 2c 33 34 68 09 09 09 09 |..mov.ah|,34h....|
|000044d0| 3b 20 4c 6f 63 61 74 65 | 20 74 68 65 20 43 72 69 |; Locate| the Cri|
|000044e0| 74 69 63 61 6c 20 53 65 | 63 2e 20 46 6c 61 67 0a |tical Se|c. Flag.|
|000044f0| 09 69 6e 74 09 32 31 68 | 0a 09 6d 6f 76 09 77 6f |.int.21h|..mov.wo|
|00004500| 72 64 20 70 74 72 20 43 | 72 69 74 53 65 63 74 46 |rd ptr C|ritSectF|
|00004510| 6c 61 67 5b 30 5d 2c 62 | 78 09 3b 6f 66 66 73 65 |lag[0],b|x.;offse|
|00004520| 74 0a 09 6d 6f 76 09 77 | 6f 72 64 20 70 74 72 20 |t..mov.w|ord ptr |
|00004530| 43 72 69 74 53 65 63 74 | 46 6c 61 67 5b 32 5d 2c |CritSect|Flag[2],|
|00004540| 65 73 09 3b 73 65 67 6d | 65 6e 74 0a 0a 09 6d 6f |es.;segm|ent...mo|
|00004550| 76 09 61 68 2c 30 39 68 | 09 09 3b 20 54 65 6c 6c |v.ah,09h|..; Tell|
|00004560| 20 74 68 65 20 75 73 65 | 72 20 74 68 61 74 20 77 | the use|r that w|
|00004570| 65 20 61 72 65 20 69 6e | 73 74 61 6c 6c 69 6e 67 |e are in|stalling|
|00004580| 0a 09 6c 65 61 09 64 78 | 2c 69 6e 73 74 5f 6d 73 |..lea.dx|,inst_ms|
|00004590| 67 0a 09 69 6e 74 09 44 | 4f 53 0a 0a 09 6d 6f 76 |g..int.D|OS...mov|
|000045a0| 09 61 68 2c 32 35 68 09 | 09 3b 20 53 65 74 20 49 |.ah,25h.|.; Set I|
|000045b0| 6e 74 65 72 72 75 70 74 | 20 56 65 63 74 6f 72 20 |nterrupt| Vector |
|000045c0| 66 6f 72 20 50 72 69 6e | 74 20 53 63 72 65 65 6e |for Prin|t Screen|
|000045d0| 0a 09 6d 6f 76 09 61 6c | 2c 30 35 68 0a 09 6c 65 |..mov.al|,05h..le|
|000045e0| 61 09 64 78 2c 69 6e 74 | 35 0a 09 69 6e 74 09 44 |a.dx,int|5..int.D|
|000045f0| 4f 53 0a 0a 09 6d 6f 76 | 09 61 68 2c 32 35 68 09 |OS...mov|.ah,25h.|
|00004600| 09 3b 20 53 65 74 20 49 | 6e 74 65 72 72 75 70 74 |.; Set I|nterrupt|
|00004610| 20 56 65 63 74 6f 72 20 | 66 6f 72 20 44 4f 53 20 | Vector |for DOS |
|00004620| 43 68 65 63 6b 0a 09 6d | 6f 76 09 61 6c 2c 32 38 |Check..m|ov.al,28|
|00004630| 68 0a 09 6c 65 61 09 64 | 78 2c 69 6e 74 32 38 0a |h..lea.d|x,int28.|
|00004640| 09 69 6e 74 09 44 4f 53 | 0a 0a 09 6d 6f 76 09 64 |.int.DOS|...mov.d|
|00004650| 78 2c 63 6f 64 65 5f 70 | 61 72 73 09 3b 20 54 65 |x,code_p|ars.; Te|
|00004660| 6c 6c 20 44 4f 53 20 68 | 6f 77 20 6d 75 63 68 20 |ll DOS h|ow much |
|00004670| 6d 65 6d 6f 72 79 20 77 | 65 20 72 65 71 75 69 72 |memory w|e requir|
|00004680| 65 0a 09 6d 6f 76 09 61 | 78 2c 33 31 30 30 68 09 |e..mov.a|x,3100h.|
|00004690| 3b 20 20 20 61 6e 64 20 | 62 65 63 6f 6d 65 20 61 |;   and |become a|
|000046a0| 20 54 53 52 0a 09 69 6e | 74 09 44 4f 53 0a 0a 69 | TSR..in|t.DOS..i|
|000046b0| 6e 73 74 61 6c 6c 09 65 | 6e 64 70 0a 0a 6e 6f 70 |nstall.e|ndp..nop|
|000046c0| 72 69 6e 74 09 09 64 62 | 09 27 44 4f 53 20 50 52 |rint..db|.'DOS PR|
|000046d0| 49 4e 54 2e 43 4f 4d 20 | 69 73 20 6e 6f 74 20 69 |INT.COM |is not i|
|000046e0| 6e 73 74 61 6c 6c 65 64 | 2e 27 2c 31 33 2c 31 30 |nstalled|.',13,10|
|000046f0| 2c 27 24 27 0a 69 6e 73 | 74 5f 65 72 72 09 64 62 |,'$'.ins|t_err.db|
|00004700| 09 27 4e 50 52 49 4e 54 | 20 61 6c 72 65 61 64 79 |.'NPRINT| already|
|00004710| 20 69 6e 73 74 61 6c 6c | 65 64 2e 27 2c 37 2c 31 | install|ed.',7,1|
|00004720| 33 2c 31 30 2c 27 24 27 | 0a 69 6e 73 74 5f 6d 73 |3,10,'$'|.inst_ms|
|00004730| 67 09 64 62 09 27 4e 50 | 52 49 4e 54 20 69 6e 73 |g.db.'NP|RINT ins|
|00004740| 74 61 6c 6c 65 64 20 73 | 75 63 63 65 73 73 66 75 |talled s|uccessfu|
|00004750| 6c 6c 79 2e 27 2c 31 33 | 2c 31 30 2c 27 24 27 0a |lly.',13|,10,'$'.|
|00004760| 0a 63 6f 64 65 5f 73 69 | 7a 65 20 3d 20 28 6f 66 |.code_si|ze = (of|
|00004770| 66 73 65 74 20 6c 61 73 | 74 62 79 74 65 20 2d 20 |fset las|tbyte - |
|00004780| 6f 66 66 73 65 74 20 65 | 6e 74 70 74 29 0a 63 6f |offset e|ntpt).co|
|00004790| 64 65 5f 70 61 72 73 20 | 3d 20 28 63 6f 64 65 5f |de_pars |= (code_|
|000047a0| 73 69 7a 65 20 2f 20 31 | 36 29 20 2b 20 33 32 0a |size / 1|6) + 32.|
|000047b0| 0a 63 73 65 67 09 65 6e | 64 73 0a 09 65 6e 64 09 |.cseg.en|ds..end.|
|000047c0| 65 6e 74 70 74 0a 53 48 | 41 52 5f 45 4f 46 0a 69 |entpt.SH|AR_EOF.i|
|000047d0| 66 20 74 65 73 74 20 31 | 37 33 33 31 20 2d 6e 65 |f test 1|7331 -ne|
|000047e0| 20 22 60 77 63 20 2d 63 | 20 3c 20 27 6e 70 72 69 | "`wc -c| < 'npri|
|000047f0| 6e 74 2e 61 73 6d 27 60 | 22 0a 74 68 65 6e 0a 09 |nt.asm'`|".then..|
|00004800| 65 63 68 6f 20 73 68 61 | 72 3a 20 65 72 72 6f 72 |echo sha|r: error|
|00004810| 20 74 72 61 6e 73 6d 69 | 74 74 69 6e 67 20 22 27 | transmi|tting "'|
|00004820| 6e 70 72 69 6e 74 2e 61 | 73 6d 27 22 20 27 28 73 |nprint.a|sm'" '(s|
|00004830| 68 6f 75 6c 64 20 68 61 | 76 65 20 62 65 65 6e 20 |hould ha|ve been |
|00004840| 31 37 33 33 31 20 63 68 | 61 72 61 63 74 65 72 73 |17331 ch|aracters|
|00004850| 29 27 0a 66 69 0a 66 69 | 20 23 20 65 6e 64 20 6f |)'.fi.fi| # end o|
|00004860| 66 20 6f 76 65 72 77 72 | 69 74 69 6e 67 20 63 68 |f overwr|iting ch|
|00004870| 65 63 6b 0a 69 66 20 74 | 65 73 74 20 2d 66 20 27 |eck.if t|est -f '|
|00004880| 6e 70 72 69 6e 74 2e 64 | 6f 63 27 0a 74 68 65 6e |nprint.d|oc'.then|
|00004890| 0a 09 65 63 68 6f 20 73 | 68 61 72 3a 20 77 69 6c |..echo s|har: wil|
|000048a0| 6c 20 6e 6f 74 20 6f 76 | 65 72 2d 77 72 69 74 65 |l not ov|er-write|
|000048b0| 20 65 78 69 73 74 69 6e | 67 20 66 69 6c 65 20 22 | existin|g file "|
|000048c0| 27 6e 70 72 69 6e 74 2e | 64 6f 63 27 22 0a 65 6c |'nprint.|doc'".el|
|000048d0| 73 65 0a 63 61 74 20 3c | 3c 20 5c 53 48 41 52 5f |se.cat <|< \SHAR_|
|000048e0| 45 4f 46 20 3e 20 27 6e | 70 72 69 6e 74 2e 64 6f |EOF > 'n|print.do|
|000048f0| 63 27 0a 09 09 09 20 20 | 20 4e 50 52 49 4e 54 20 |c'....  | NPRINT |
|00004900| 76 31 2e 30 0a 0a 09 09 | 20 28 63 29 20 31 39 39 |v1.0....| (c) 199|
|00004910| 30 20 62 79 20 43 68 72 | 69 73 74 6f 70 68 65 72 |0 by Chr|istopher|
|00004920| 20 44 2e 20 4f 72 72 0a | 0a 0a 4f 56 45 52 56 49 | D. Orr.|..OVERVI|
|00004930| 45 57 3a 0a 0a 20 20 20 | 4e 50 52 49 4e 54 20 69 |EW:..   |NPRINT i|
|00004940| 73 20 61 20 54 53 52 20 | 64 65 73 69 67 6e 65 64 |s a TSR |designed|
|00004950| 20 74 6f 20 70 72 6f 6d | 70 74 20 74 68 65 20 75 | to prom|pt the u|
|00004960| 73 65 72 20 66 6f 72 20 | 61 20 66 69 6c 65 6e 61 |ser for |a filena|
|00004970| 6d 65 20 61 6e 64 0a 70 | 61 73 73 20 74 68 61 74 |me and.p|ass that|
|00004980| 20 66 69 6c 65 20 6f 66 | 66 20 74 6f 20 44 4f 53 | file of|f to DOS|
|00004990| 27 73 20 50 52 49 4e 54 | 2e 43 4f 4d 2e 20 20 49 |'s PRINT|.COM.  I|
|000049a0| 66 20 6e 6f 20 66 69 6c | 65 6e 61 6d 65 20 69 73 |f no fil|ename is|
|000049b0| 0a 73 70 65 63 69 66 69 | 65 64 2c 20 4e 50 52 49 |.specifi|ed, NPRI|
|000049c0| 4e 54 20 77 69 6c 6c 20 | 61 74 74 65 6d 70 74 20 |NT will |attempt |
|000049d0| 61 20 70 72 69 6e 74 20 | 73 63 72 65 65 6e 2e 20 |a print |screen. |
|000049e0| 20 49 66 20 6e 6f 20 70 | 72 69 6e 74 65 72 20 69 | If no p|rinter i|
|000049f0| 73 0a 64 65 74 65 63 74 | 65 64 20 28 6f 72 20 61 |s.detect|ed (or a|
|00004a00| 20 70 72 69 6e 74 20 65 | 72 72 6f 72 20 6f 63 63 | print e|rror occ|
|00004a10| 75 72 73 29 2c 20 4e 50 | 52 49 4e 54 20 77 69 6c |urs), NP|RINT wil|
|00004a20| 6c 20 69 6e 66 6f 72 6d | 20 74 68 65 20 75 73 65 |l inform| the use|
|00004a30| 72 0a 61 6e 64 20 61 62 | 6f 72 74 20 74 68 65 20 |r.and ab|ort the |
|00004a40| 70 72 69 6e 74 20 73 63 | 72 65 65 6e 2e 20 20 49 |print sc|reen.  I|
|00004a50| 66 20 61 20 70 72 69 6e | 74 20 73 63 72 65 65 6e |f a prin|t screen|
|00004a60| 20 69 73 20 73 75 63 63 | 65 73 73 66 75 6c 2c 0a | is succ|essful,.|
|00004a70| 4e 50 52 49 4e 54 20 77 | 69 6c 6c 20 73 65 6e 64 |NPRINT w|ill send|
|00004a80| 20 61 20 66 6f 72 6d 66 | 65 65 64 20 74 6f 20 74 | a formf|eed to t|
|00004a90| 68 65 20 70 72 69 6e 74 | 65 72 2e 0a 0a 0a 0a 46 |he print|er.....F|
|00004aa0| 55 4e 43 54 49 4f 4e 41 | 4c 20 44 45 53 43 52 49 |UNCTIONA|L DESCRI|
|00004ab0| 50 54 49 4f 4e 3a 0a 0a | 20 20 2a 20 20 4e 50 52 |PTION:..|  *  NPR|
|00004ac0| 49 4e 54 20 77 69 6c 6c | 20 6f 6e 6c 79 20 61 63 |INT will| only ac|
|00004ad0| 74 69 76 61 74 65 20 69 | 6e 20 6d 6f 64 65 73 20 |tivate i|n modes |
|00004ae0| 33 20 6f 72 20 37 2e 0a | 20 20 2a 20 20 54 68 65 |3 or 7..|  *  The|
|00004af0| 20 32 35 74 68 20 74 65 | 78 74 20 6c 69 6e 65 20 | 25th te|xt line |
|00004b00| 69 73 20 73 61 76 65 64 | 2e 0a 20 20 2a 20 20 54 |is saved|..  *  T|
|00004b10| 68 65 20 75 73 65 72 20 | 69 73 20 70 72 6f 6d 70 |he user |is promp|
|00004b20| 74 65 64 20 74 6f 20 65 | 6e 74 65 72 20 61 20 66 |ted to e|nter a f|
|00004b30| 69 6c 65 6e 61 6d 65 20 | 6f 6e 20 74 68 65 20 32 |ilename |on the 2|
|00004b40| 35 74 68 20 74 65 78 74 | 20 6c 69 6e 65 2e 0a 20 |5th text| line.. |
|00004b50| 20 2a 20 20 41 20 72 65 | 71 75 65 73 74 20 69 73 | *  A re|quest is|
|00004b60| 20 6d 61 64 65 20 74 6f | 20 50 52 49 4e 54 20 74 | made to| PRINT t|
|00004b70| 6f 20 70 72 69 6e 74 20 | 74 68 65 20 66 69 6c 65 |o print |the file|
|00004b80| 2e 0a 20 20 2a 20 20 45 | 72 72 6f 72 73 20 72 65 |..  *  E|rrors re|
|00004b90| 74 75 72 6e 65 64 20 62 | 79 20 50 52 49 4e 54 20 |turned b|y PRINT |
|00004ba0| 61 72 65 20 64 69 73 70 | 6c 61 79 65 64 20 74 6f |are disp|layed to|
|00004bb0| 20 74 68 65 20 75 73 65 | 72 2e 0a 20 20 2a 20 20 | the use|r..  *  |
|00004bc0| 54 68 65 20 32 35 74 68 | 20 74 65 78 74 20 6c 69 |The 25th| text li|
|00004bd0| 6e 65 20 69 73 20 72 65 | 73 74 6f 72 65 64 2e 0a |ne is re|stored..|
|00004be0| 0a 20 20 2a 20 20 41 20 | 62 6c 61 6e 6b 20 66 69 |.  *  A |blank fi|
|00004bf0| 6c 65 6e 61 6d 65 20 77 | 69 6c 6c 20 63 61 75 73 |lename w|ill caus|
|00004c00| 65 20 61 20 70 72 69 6e | 74 20 73 63 72 65 65 6e |e a prin|t screen|
|00004c10| 20 74 6f 20 6f 63 63 75 | 72 0a 20 20 2a 20 20 4e | to occu|r.  *  N|
|00004c20| 50 52 49 4e 54 20 63 68 | 65 63 6b 73 20 74 6f 20 |PRINT ch|ecks to |
|00004c30| 73 65 65 20 69 66 20 74 | 68 65 20 70 72 69 6e 74 |see if t|he print|
|00004c40| 65 72 20 69 73 20 61 76 | 61 69 6c 61 62 6c 65 0a |er is av|ailable.|
|00004c50| 20 20 2a 20 20 49 66 20 | 74 68 65 20 70 72 69 6e |  *  If |the prin|
|00004c60| 74 65 72 20 69 73 20 6e | 6f 74 20 61 76 61 69 6c |ter is n|ot avail|
|00004c70| 61 62 6c 65 2c 20 4e 50 | 52 49 4e 54 20 77 69 6c |able, NP|RINT wil|
|00004c80| 6c 20 6e 6f 74 20 61 74 | 74 65 6d 70 74 20 61 20 |l not at|tempt a |
|00004c90| 70 72 69 6e 74 20 73 63 | 72 65 65 6e 0a 20 20 2a |print sc|reen.  *|
|00004ca0| 20 20 41 66 74 65 72 20 | 61 20 73 75 63 63 65 73 |  After |a succes|
|00004cb0| 73 66 75 6c 20 70 72 69 | 6e 74 20 73 63 72 65 65 |sful pri|nt scree|
|00004cc0| 6e 2c 20 4e 50 52 49 4e | 54 20 77 69 6c 6c 20 73 |n, NPRIN|T will s|
|00004cd0| 65 6e 64 20 61 20 66 6f | 72 6d 66 65 65 64 20 74 |end a fo|rmfeed t|
|00004ce0| 6f 20 74 68 65 20 70 72 | 69 6e 74 65 72 0a 0a 0a |o the pr|inter...|
|00004cf0| 0a 41 43 54 49 56 41 54 | 49 4f 4e 3a 0a 20 20 4e |.ACTIVAT|ION:.  N|
|00004d00| 50 52 49 4e 54 20 69 73 | 20 61 63 74 69 76 61 74 |PRINT is| activat|
|00004d10| 65 64 20 62 79 20 70 72 | 65 73 73 69 6e 67 20 74 |ed by pr|essing t|
|00004d20| 68 65 20 5b 50 72 74 53 | 63 72 5d 20 6b 65 79 2e |he [PrtS|cr] key.|
|00004d30| 0a 53 48 41 52 5f 45 4f | 46 0a 69 66 20 74 65 73 |.SHAR_EO|F.if tes|
|00004d40| 74 20 31 30 38 36 20 2d | 6e 65 20 22 60 77 63 20 |t 1086 -|ne "`wc |
|00004d50| 2d 63 20 3c 20 27 6e 70 | 72 69 6e 74 2e 64 6f 63 |-c < 'np|rint.doc|
|00004d60| 27 60 22 0a 74 68 65 6e | 0a 09 65 63 68 6f 20 73 |'`".then|..echo s|
|00004d70| 68 61 72 3a 20 65 72 72 | 6f 72 20 74 72 61 6e 73 |har: err|or trans|
|00004d80| 6d 69 74 74 69 6e 67 20 | 22 27 6e 70 72 69 6e 74 |mitting |"'nprint|
|00004d90| 2e 64 6f 63 27 22 20 27 | 28 73 68 6f 75 6c 64 20 |.doc'" '|(should |
|00004da0| 68 61 76 65 20 62 65 65 | 6e 20 31 30 38 36 20 63 |have bee|n 1086 c|
|00004db0| 68 61 72 61 63 74 65 72 | 73 29 27 0a 66 69 0a 66 |haracter|s)'.fi.f|
|00004dc0| 69 20 23 20 65 6e 64 20 | 6f 66 20 6f 76 65 72 77 |i # end |of overw|
|00004dd0| 72 69 74 69 6e 67 20 63 | 68 65 63 6b 0a 23 09 45 |riting c|heck.#.E|
|00004de0| 6e 64 20 6f 66 20 73 68 | 65 6c 6c 20 61 72 63 68 |nd of sh|ell arch|
|00004df0| 69 76 65 0a 65 78 69 74 | 20 30 0a 4e 65 77 73 67 |ive.exit| 0.Newsg|
|00004e00| 72 6f 75 70 73 3a 20 63 | 6f 6d 70 2e 73 79 73 2e |roups: c|omp.sys.|
|00004e10| 69 62 6d 2e 70 63 2e 70 | 72 6f 67 72 61 6d 6d 65 |ibm.pc.p|rogramme|
|00004e20| 72 0a 53 75 62 6a 65 63 | 74 3a 20 4e 50 52 49 4e |r.Subjec|t: NPRIN|
|00004e30| 54 3a 20 20 61 20 54 53 | 52 20 74 6f 20 73 75 62 |T:  a TS|R to sub|
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|000051b0| 2a 2a 2a 2a 2a 2a 2a 2a | 2a 2a 2a 2a 2a 2a 2a 2a |********|********|
|000051c0| 2a 2a 2a 2a 2a 2a 2a 2a | 2a 2a 2a 2a 2a 2a 2a 2a |********|********|
|000051d0| 2a 2a 2a 2a 2a 2a 2a 2a | 2a 2a 2a 2a 2a 2a 2a 2a |********|********|
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|00005930| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00005940| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
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|000059f0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00005a00| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00005a10| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00005a20| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
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|00005a40| 63 09 66 61 72 0a 69 6e | 74 32 38 3a 0a 09 63 6d |c.far.in|t28:..cm|
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|00005a60| 67 5d 2c 20 30 46 46 68 | 09 3b 20 53 68 6f 75 6c |g], 0FFh|.; Shoul|
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|00005a90| 72 74 20 69 6e 74 5f 72 | 65 74 75 72 6e 09 3b 20 |rt int_r|eturn.; |
|00005aa0| 4e 6f 2c 20 73 6f 20 67 | 65 74 20 6f 75 74 0a 09 |No, so g|et out..|
|00005ab0| 63 61 6c 6c 09 6d 61 69 | 6e 09 09 09 3b 20 49 6e |call.mai|n...; In|
|00005ac0| 76 6f 6b 65 20 4e 50 52 | 49 4e 54 0a 09 70 75 73 |voke NPR|INT..pus|
|00005ad0| 68 66 09 09 09 09 3b 20 | 50 75 73 68 20 74 68 65 |hf....; |Push the|
|00005ae0| 20 66 6c 61 67 73 0a 09 | 63 6c 69 09 09 09 09 3b | flags..|cli....;|
|00005af0| 20 44 69 73 61 62 6c 65 | 20 69 6e 74 65 72 72 75 | Disable| interru|
|00005b00| 70 74 73 0a 09 70 75 73 | 68 09 63 73 09 09 09 3b |pts..pus|h.cs...;|
|00005b10| 20 50 75 73 68 20 74 68 | 65 20 43 53 20 72 65 67 | Push th|e CS reg|
|00005b20| 69 73 74 65 72 0a 09 6d | 6f 76 09 64 69 2c 6f 66 |ister..m|ov.di,of|
|00005b30| 66 73 65 74 20 63 73 3a | 69 6e 74 5f 72 65 74 75 |fset cs:|int_retu|
|00005b40| 72 6e 09 3b 20 57 68 65 | 6e 20 77 65 20 72 65 74 |rn.; Whe|n we ret|
|00005b50| 75 72 6e 2c 20 77 65 20 | 77 61 6e 74 20 74 6f 20 |urn, we |want to |
|00005b60| 65 78 69 74 0a 09 70 75 | 73 68 09 64 69 0a 09 6a |exit..pu|sh.di..j|
|00005b70| 6d 70 09 64 77 6f 72 64 | 20 70 74 72 20 63 73 3a |mp.dword| ptr cs:|
|00005b80| 6f 6c 64 5f 69 6e 74 5f | 32 38 09 3b 20 54 72 61 |old_int_|28.; Tra|
|00005b90| 6e 73 66 65 72 20 63 6f | 6e 74 72 6f 6c 20 74 6f |nsfer co|ntrol to|
|00005ba0| 20 6f 6c 64 20 69 6e 74 | 20 32 38 68 0a 0a 69 6e | old int| 28h..in|
|00005bb0| 74 35 3a 0a 09 70 75 73 | 68 09 62 78 0a 09 70 75 |t5:..pus|h.bx..pu|
|00005bc0| 73 68 09 65 73 0a 09 6d | 6f 76 09 62 78 2c 77 6f |sh.es..m|ov.bx,wo|
|00005bd0| 72 64 20 70 74 72 20 43 | 72 69 74 53 65 63 74 46 |rd ptr C|ritSectF|
|00005be0| 6c 61 67 5b 30 5d 09 3b | 20 4c 6f 6f 6b 20 61 74 |lag[0].;| Look at|
|00005bf0| 20 74 68 65 20 43 72 69 | 74 2e 20 53 65 63 2e 20 | the Cri|t. Sec. |
|00005c00| 46 6c 61 67 0a 09 6d 6f | 76 09 65 73 2c 77 6f 72 |Flag..mo|v.es,wor|
|00005c10| 64 20 70 74 72 20 43 72 | 69 74 53 65 63 74 46 6c |d ptr Cr|itSectFl|
|00005c20| 61 67 5b 32 5d 0a 09 63 | 6d 70 09 62 79 74 65 20 |ag[2]..c|mp.byte |
|00005c30| 70 74 72 20 65 73 3a 5b | 62 78 5d 2c 30 68 09 09 |ptr es:[|bx],0h..|
|00005c40| 3b 20 49 66 20 6e 6f 6e | 2d 7a 65 72 6f 2c 20 44 |; If non|-zero, D|
|00005c50| 4f 53 20 69 73 20 62 75 | 73 79 0a 09 6a 65 09 6f |OS is bu|sy..je.o|
|00005c60| 6b 32 72 75 6e 09 09 09 | 09 3b 20 5a 65 72 6f 2c |k2run...|.; Zero,|
|00005c70| 20 73 6f 20 69 6e 76 6f | 6b 65 20 4e 50 52 49 4e | so invo|ke NPRIN|
|00005c80| 54 0a 09 70 6f 70 09 65 | 73 0a 09 70 6f 70 09 62 |T..pop.e|s..pop.b|
|00005c90| 78 0a 09 6d 6f 76 09 63 | 73 3a 5b 69 6e 76 6f 6b |x..mov.c|s:[invok|
|00005ca0| 65 5f 66 6c 61 67 5d 2c | 20 30 46 46 68 09 09 3b |e_flag],| 0FFh..;|
|00005cb0| 20 4c 65 61 76 65 20 61 | 20 66 6c 61 67 20 74 6f | Leave a| flag to|
|00005cc0| 20 74 65 6c 6c 20 75 73 | 20 74 6f 0a 09 6a 6d 70 | tell us| to..jmp|
|00005cd0| 09 73 68 6f 72 74 20 69 | 6e 74 5f 72 65 74 75 72 |.short i|nt_retur|
|00005ce0| 6e 0a 0a 6f 6b 32 72 75 | 6e 3a 0a 09 70 6f 70 09 |n..ok2ru|n:..pop.|
|00005cf0| 65 73 0a 09 70 6f 70 09 | 62 78 0a 09 63 61 6c 6c |es..pop.|bx..call|
|00005d00| 09 6d 61 69 6e 09 09 09 | 09 3b 20 43 61 6c 6c 20 |.main...|.; Call |
|00005d10| 4e 50 52 49 4e 54 0a 0a | 69 6e 74 5f 72 65 74 75 |NPRINT..|int_retu|
|00005d20| 72 6e 3a 0a 09 69 72 65 | 74 09 09 09 09 09 3b 20 |rn:..ire|t.....; |
|00005d30| 61 6e 64 20 77 65 20 72 | 65 74 75 72 6e 20 2e 2e |and we r|eturn ..|
|00005d40| 2e 0a 0a 65 6e 64 70 09 | 6e 70 72 69 6e 74 0a 0a |...endp.|nprint..|
|00005d50| 0a 3b 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |.;------|--------|
|00005d60| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00005d70| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00005d80| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00005d90| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 0a |--------|-------.|
|00005da0| 3b 20 20 4d 61 69 6e 20 | 50 72 6f 63 65 64 75 72 |;  Main |Procedur|
|00005db0| 65 20 2d 20 52 65 73 70 | 6f 6e 73 69 62 6c 65 20 |e - Resp|onsible |
|00005dc0| 66 6f 72 20 70 72 6f 63 | 65 73 73 69 6e 67 20 75 |for proc|essing u|
|00005dd0| 73 65 72 20 72 65 71 75 | 65 73 74 0a 3b 2d 2d 2d |ser requ|est.;---|
|00005de0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00005df0| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00005e00| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00005e10| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 2d 2d 2d 2d 2d 2d |--------|--------|
|00005e20| 2d 2d 2d 2d 2d 2d 2d 2d | 2d 2d 0a 6d 61 69 6e 09 |--------|--.main.|
|00005e30| 70 72 6f 63 09 6e 65 61 | 72 0a 09 73 74 69 09 09 |proc.nea|r..sti..|
|00005e40| 09 3b 20 41 6c 6c 6f 77 | 20 49 6e 74 65 72 72 75 |.; Allow| Interru|
|00005e50| 70 74 73 0a 0a 09 70 75 | 73 68 09 62 70 09 09 3b |pts...pu|sh.bp..;|
|00005e60| 20 41 63 63 65 73 73 20 | 74 6f 20 73 74 61 63 6b | Access |to stack|
|00005e70| 0a 09 6d 6f 76 09 62 70 | 2c 73 70 09 09 3b 20 42 |..mov.bp|,sp..; B|
|00005e80| 65 66 6f 72 65 20 77 65 | 20 70 75 73 68 20 61 6e |efore we| push an|
|00005e90| 79 74 68 69 6e 67 0a 0a | 09 70 75 73 68 66 09 09 |ything..|.pushf..|
|00005ea0| 09 3b 20 53 61 76 65 20 | 74 68 65 20 73 74 61 74 |.; Save |the stat|
|00005eb0| 65 20 6f 66 20 74 68 65 | 20 6d 61 63 68 69 6e 65 |e of the| machine|
|00005ec0| 0a 09 70 75 73 68 09 65 | 73 09 09 3b 20 62 65 63 |..push.e|s..; bec|
|00005ed0| 61 75 73 65 20 77 65 27 | 72 65 20 67 6f 6e 6e 61 |ause we'|re gonna|
|00005ee0| 20 6d 61 6b 65 0a 09 70 | 75 73 68 09 64 73 09 09 | make..p|ush.ds..|
|00005ef0| 3b 20 61 20 6d 65 73 73 | 20 6f 66 20 69 74 0a 09 |; a mess| of it..|
|00005f00| 70 75 73 68 09 64 69 0a | 09 70 75 73 68 09 73 69 |push.di.|.push.si|
|00005f10| 0a 09 70 75 73 68 09 64 | 78 0a 09 70 75 73 68 09 |..push.d|x..push.|
|00005f20| 63 78 0a 09 70 75 73 68 | 09 62 78 0a 09 70 75 73 |cx..push|.bx..pus|
|00005f30| 68 09 61 78 0a 0a 09 6d | 6f 76 09 61 78 2c 63 73 |h.ax...m|ov.ax,cs|
|00005f40| 09 09 09 3b 20 45 73 74 | 61 62 6c 69 73 68 20 74 |...; Est|ablish t|
|00005f50| 68 65 20 70 72 6f 70 65 | 72 20 73 65 67 6d 65 6e |he prope|r segmen|
|00005f60| 74 73 0a 09 6d 6f 76 09 | 64 73 2c 61 78 0a 09 6d |ts..mov.|ds,ax..m|
|00005f70| 6f 76 09 65 73 2c 61 78 | 09 09 09 3b 20 4d 61 6b |ov.es,ax|...; Mak|
|00005f80| 65 20 45 53 20 70 6f 69 | 6e 74 20 74 6f 20 63 6f |e ES poi|nt to co|
|00005f90| 64 65 20 73 65 67 6d 65 | 6e 74 0a 09 61 73 73 75 |de segme|nt..assu|
|00005fa0| 6d 65 09 64 73 3a 63 73 | 65 67 2c 20 65 73 3a 63 |me.ds:cs|eg, es:c|
|00005fb0| 73 65 67 09 3b 20 54 65 | 6c 6c 20 74 68 65 20 61 |seg.; Te|ll the a|
|00005fc0| 73 73 65 6d 62 6c 65 72 | 0a 0a 0a 6f 6b 32 6c 6f |ssembler|...ok2lo|
|00005fd0| 61 64 3a 0a 09 6d 6f 76 | 09 5b 69 6e 76 6f 6b 65 |ad:..mov|.[invoke|
|00005fe0| 5f 66 6c 61 67 5d 2c 20 | 30 68 09 3b 20 43 6c 65 |_flag], |0h.; Cle|
|00005ff0| 61 72 20 49 6e 76 6f 63 | 61 74 69 6f 6e 20 66 6c |ar Invoc|ation fl|
|00006000| 61 67 0a 0a 09 6d 6f 76 | 09 61 68 2c 30 66 68 09 |ag...mov|.ah,0fh.|
|00006010| 09 09 3b 20 47 65 74 20 | 74 68 65 20 63 75 72 72 |..; Get |the curr|
|00006020| 65 6e 74 20 44 69 73 70 | 6c 61 79 20 4d 6f 64 65 |ent Disp|lay Mode|
|00006030| 0a 09 69 6e 74 09 56 49 | 44 45 4f 0a 09 6d 6f 76 |..int.VI|DEO..mov|
|00006040| 09 5b 64 69 73 70 6c 61 | 79 5f 70 61 67 65 5d 2c |.[displa|y_page],|
|00006050| 62 68 09 3b 20 53 61 76 | 65 20 63 75 72 72 65 6e |bh.; Sav|e curren|
|00006060| 74 20 70 61 67 65 0a 09 | 63 6d 70 09 61 6c 2c 30 |t page..|cmp.al,0|
|00006070| 37 68 09 09 09 3b 20 49 | 73 20 74 68 69 73 20 61 |7h...; I|s this a|
|00006080| 20 4d 6f 6e 6f 63 68 72 | 6f 6d 65 20 4d 6f 6e 69 | Monochr|ome Moni|
|00006090| 74 6f 72 20 3f 0a 09 6a | 65 09 6d 6f 6e 6f 09 09 |tor ?..j|e.mono..|
|000060a0| 09 3b 20 59 65 73 2c 20 | 73 6f 20 77 65 20 61 72 |.; Yes, |so we ar|
|000060b0| 65 20 6f 6b 61 79 0a 09 | 63 6d 70 09 61 6c 2c 30 |e okay..|cmp.al,0|
|000060c0| 33 68 09 09 09 3b 20 49 | 73 20 74 68 69 73 20 61 |3h...; I|s this a|
|000060d0| 20 43 47 41 20 4d 6f 6e | 69 74 6f 72 20 69 6e 20 | CGA Mon|itor in |
|000060e0| 38 30 20 63 6f 6c 20 6d | 6f 64 65 3f 0a 09 6a 65 |80 col m|ode?..je|
|000060f0| 09 63 67 61 09 09 09 3b | 20 59 65 73 2c 20 73 6f |.cga...;| Yes, so|
|00006100| 20 77 65 20 61 72 65 20 | 6f 6b 61 79 0a 09 63 61 | we are |okay..ca|
|00006110| 6c 6c 09 72 69 6e 67 5f | 62 65 6c 6c 09 09 3b 20 |ll.ring_|bell..; |
|00006120| 4e 6f 20 2d 20 73 6f 20 | 64 6f 6e 27 74 20 65 78 |No - so |don't ex|
|00006130| 65 63 75 74 65 2e 20 20 | 4a 75 73 74 20 61 62 6f |ecute.  |Just abo|
|00006140| 72 74 2e 0a 09 6a 6d 70 | 09 64 6f 6e 65 09 09 09 |rt...jmp|.done...|
|00006150| 3b 20 45 78 69 74 20 4e | 50 52 49 4e 54 0a 0a 6d |; Exit N|PRINT..m|
|00006160| 6f 6e 6f 3a 0a 09 6d 6f | 76 09 61 78 2c 4d 4f 4e |ono:..mo|v.ax,MON|
|00006170| 4f 53 43 52 09 3b 20 4d | 6f 6e 6f 63 68 72 6f 6d |OSCR.; M|onochrom|
|00006180| 65 20 44 69 73 70 6c 61 | 79 0a 09 6a 6d 70 09 73 |e Displa|y..jmp.s|
|00006190| 68 6f 72 74 20 73 61 76 | 65 6c 69 6e 65 0a 63 67 |hort sav|eline.cg|
|000061a0| 61 3a 0a 09 6d 6f 76 09 | 61 78 2c 43 4f 4c 4f 52 |a:..mov.|ax,COLOR|
|000061b0| 53 43 52 09 3b 20 43 47 | 41 20 64 69 73 70 6c 61 |SCR.; CG|A displa|
|000061c0| 79 0a 0a 73 61 76 65 6c | 69 6e 65 3a 0a 09 6d 6f |y..savel|ine:..mo|
|000061d0| 76 09 64 73 2c 61 78 09 | 09 3b 20 53 65 74 20 75 |v.ds,ax.|.; Set u|
|000061e0| 70 20 74 68 65 20 44 61 | 74 61 20 53 65 67 6d 65 |p the Da|ta Segme|
|000061f0| 6e 74 0a 09 6d 6f 76 09 | 73 69 2c 33 38 34 30 09 |nt..mov.|si,3840.|
|00006200| 09 3b 20 53 74 61 72 74 | 20 61 74 20 70 6f 73 69 |.; Start| at posi|
|00006210| 74 69 6f 6e 20 72 6f 77 | 3d 32 35 2c 20 63 6f 6c |tion row|=25, col|
|00006220| 75 6d 6e 3d 31 0a 09 6d | 6f 76 09 63 78 2c 38 30 |umn=1..m|ov.cx,80|
|00006230| 09 09 3b 20 38 30 20 43 | 68 61 72 61 63 74 65 72 |..; 80 C|haracter|
|00006240| 20 6c 69 6e 65 73 0a 09 | 6c 65 61 09 64 69 2c 20 | lines..|lea.di, |
|00006250| 73 63 72 65 65 6e 62 75 | 66 0a 09 70 75 73 68 09 |screenbu|f..push.|
|00006260| 65 73 09 09 3b 20 53 61 | 76 65 20 73 63 72 65 65 |es..; Sa|ve scree|
|00006270| 6e 20 6d 65 6d 6f 72 79 | 20 6c 6f 63 61 74 69 6f |n memory| locatio|
|00006280| 6e 73 0a 09 70 75 73 68 | 09 64 73 0a 09 70 75 73 |ns..push|.ds..pus|
|00006290| 68 09 73 69 0a 09 63 6c | 64 09 09 09 3b 20 4d 61 |h.si..cl|d...; Ma|
|000062a0| 6b 65 20 73 75 72 65 20 | 77 65 20 63 6f 70 79 20 |ke sure |we copy |
|000062b0| 66 72 6f 6d 20 72 69 67 | 68 74 20 74 6f 20 6c 65 |from rig|ht to le|
|000062c0| 66 74 0a 09 72 65 70 09 | 6d 6f 76 73 77 09 09 3b |ft..rep.|movsw..;|
|000062d0| 20 4d 6f 76 65 20 63 68 | 61 72 61 63 74 65 72 20 | Move ch|aracter |
|000062e0| 26 20 41 74 74 72 69 62 | 75 74 65 0a 0a 09 6d 6f |& Attrib|ute...mo|
|000062f0| 76 09 61 78 2c 63 73 09 | 09 3b 20 52 65 73 74 6f |v.ax,cs.|.; Resto|
|00006300| 72 65 20 74 68 65 20 44 | 61 74 61 20 53 65 67 6d |re the D|ata Segm|
|00006310| 65 6e 74 0a 09 6d 6f 76 | 09 64 73 2c 61 78 0a 0a |ent..mov|.ds,ax..|
|00006320| 09 6d 6f 76 09 61 68 2c | 30 33 68 09 09 3b 20 47 |.mov.ah,|03h..; G|
|00006330| 65 74 20 74 68 65 20 43 | 75 72 72 65 6e 74 20 43 |et the C|urrent C|
|00006340| 75 72 73 6f 72 20 50 6f | 73 69 74 69 6f 6e 0a 09 |ursor Po|sition..|
|00006350| 69 6e 74 09 56 49 44 45 | 4f 0a 09 6d 6f 76 09 5b |int.VIDE|O..mov.[|
|00006360| 63 75 72 73 6f 72 5d 2c | 20 64 78 09 3b 20 20 20 |cursor],| dx.;   |
|00006370| 20 61 6e 64 20 73 61 76 | 65 20 69 74 2e 0a 0a 09 | and sav|e it....|
|00006380| 63 61 6c 6c 09 63 6c 65 | 61 72 5f 32 35 09 3b 20 |call.cle|ar_25.; |
|00006390| 47 6f 74 6f 20 61 6e 64 | 20 43 6c 65 61 72 20 4c |Goto and| Clear L|
|000063a0| 69 6e 65 20 23 32 35 0a | 09 6c 65 61 09 73 69 2c |ine #25.|.lea.si,|
|000063b0| 20 70 72 6f 6d 70 74 09 | 3b 20 44 69 73 70 6c 61 | prompt.|; Displa|
|000063c0| 79 20 74 68 65 20 66 69 | 6c 65 6e 61 6d 65 20 70 |y the fi|lename p|
|000063d0| 72 6f 6d 70 74 20 66 6f | 72 20 74 68 65 20 75 73 |rompt fo|r the us|
|000063e0| 65 72 0a 09 63 61 6c 6c | 09 77 72 5f 73 74 72 69 |er..call|.wr_stri|
|000063f0| 6e 67 0a 0a 09 6c 65 61 | 09 64 78 2c 66 69 6c 65 |ng...lea|.dx,file|
+--------+-------------------------+-------------------------+--------+--------+