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Assembly Source File | 1980-01-01 | 129.9 KB | 3,676 lines

.XLIST ; KERMIT - KL10 Error-free Reciprocal Micro Interconnect over TTY-lines ; ; Program Version 1.0, Kermit Protocol Version 1 ; February 1, 1983 ; ; Based on the KERMIT Protocol. ; ; Copyright (C) 1982,1983 Trustees of Columbia University ; ; Daphne Tzoar ; Columbia University Computer Center ; 612 W. 115th St. ; New York City, NY 10025 ; ; Special thanks to Frank da Cruz, Bill Catchings, Steve Jensen, ; Vace Kundakci, and Bernie Eiben for their help and contributions. ; This file is the global data area for all the Kermit modules. IBMPC EQU 1 ; For IBM PC conditional assembly. STEVE EQU 0 ; For Steve's homebrew assembly. BELL EQU 07Q TAB EQU 11Q LF EQU 12Q FF EQU 14Q CR EQU 15Q XON EQU 21Q XOFF EQU 23Q ESC EQU 33Q DEL EQU 177Q BS EQU 08H BIOS EQU 10H DOS EQU 21H COMM EQU 14H KEYB EQU 16H CONIN EQU 01H CONOUT EQU 02H RDRIN EQU 03H PUNOUT EQU 04H LSTOUT EQU 05H DCONIO EQU 06H GTIOB EQU 07H PRSTR EQU 09H CONSTAT EQU 0BH OPENF EQU 0FH CLOSF EQU 10H SFIRST EQU 11H SNEXT EQU 12H DELF EQU 13H READF EQU 14H ; Read from the file. WRITEF EQU 15H MAKEF EQU 16H CFLSZ EQU 23H DEFESC EQU ']'-100Q ; The default escape character. MAXPKT EQU '~'-' '+2Q ; Maximum size of a packet. MAXTRY EQU 05Q ; Default number of retries on a packet. IMXTRY EQU 20Q ; Default number of retries send initiate. DRPSIZ EQU 5EH ; Default receive packet size. DSPSIZ EQU 20H ; Default send packet size. DSTIME EQU 08H ; Default send time out interval. DRTIME EQU 05H ; Default receive time out interval. DSPAD EQU 00H ; Default send padding. DRPAD EQU 00H ; Default receive padding. DSPADC EQU 00H ; Default send padding char. DRPADC EQU 00H ; Default receive padding char. DSEOL EQU CR ; Default send EOL char. DREOL EQU CR ; Default receive EOL char. DSQUOT EQU '#' ; Default send quote char. DRQUOT EQU '#' ; Default receive quote char. SOH EQU 01H ; Start of header char. BUFSIZ EQU 80H ; Size of DMA. MAXFIL EQU 50H ; Maximum number of files allowed. DIASW EQU 01H ; Default is diagnostics on. CMKEY EQU 01H ; Parse a keyword. CMIFI EQU 02H ; Parse an input file spec (can be wild). CMOFI EQU 03H ; Parse an output file spec. CMCFM EQU 04H ; Parse a confirm. TIMER EQU 40H ; Use to issue short beep. PORT_B EQU 61H ; Port B address. B0300 EQU 180H ; Variables for 300 baud, 1200, etc. B1200 EQU 60H B1800 EQU 40H B2400 EQU 30H B4800 EQU 18H B9600 EQU 0CH STACK SEGMENT PARA STACK 'STACK' DW 100 DUP(0) ; Initialize stack to all zeros. STK EQU THIS WORD STACK ENDS DATAS SEGMENT PARA PUBLIC 'DATAS' ; Pure storage. versio db 'CUCCA IBM-PC Kermit-86 - ver 1.0',cr,lf, db 'Field Test Version',cr,lf,'$' kerm db 'Kermit-86>$' spmes db 'Spack: $' rpmes db 'Rpack: $' hibit db 'Warning - Non Ascii char$' tmp db ? foo db '$' crlf db cr,lf,'$' tmsg1 db cr,lf,'[Connecting to host,' db 'type Ctrl-]-C to return to PC]',cr,lf,'$' tmsg2 db cr,lf,'[Back at micro]',cr,lf,'$' ermes1 db cr,lf,'?Unregonized command$' ermes2 db cr,lf,'?Illegal character$' ermes3 db cr,lf,'?Not confirmed$' ermes4 db 'Unable to rename file$' ermes5 db cr,lf,'?Disk full$' ermes7 db '?Unable to receive initiate$' ermes8 db '?Unable to receive file name$' ermes9 db '?Unable to receive end of file$' erms10 db '?Unable to receive data$' erms11 db '?Disk full$' erms14 db '?Unable to receive an acknowledgement from the host$' erms15 db '?Unable to find file$' erms19 db 'Record length exceeds size of buffer$' dimsg1 db '%Bad checksum$' infms0 db 'Waiting .....$' infms1 db 'Receiving ...$' infms2 db 'Sending .....$' infms3 db 'Completed $' infms4 db 'Failed $' infms5 db 'Renaming file to $' cfrmes db ' Confirm with carriage return $' ; filhlp db ' Input file spec (possibly wild) $' filhlp db ' Input file spec $' ;spchar db $,&,#,@,!,%,',(,),-,<,>,{,},_,\,^,~,|,` spchar db 24H,26H,23H,40H,21H,25H,27H,28H,29H,2DH db 3CH,3EH,7BH,7DH,5FH,5CH,5EH,7EH,7CH,60H escmes db cr,lf,'Type the new escape character: $' eschlp db cr,lf,'Enter literal value (ex: Cntrl ]) $' tophlp db cr,lf,'CONNECT to host on selected port' db cr,lf,'EXIT to DOS' db cr,lf,'HELP by giving this message' db cr,lf,'RECEIVE file from host' db cr,lf,'SEND file to host' db cr,lf,'SET a parameter' ; db cr,lf,'SHOW the parameters' db cr,lf,'STATUS of Kermit$' sethlp db cr,lf,'BAUD rate' db cr,lf,'DEBUG' db cr,lf,'ESCAPE character change' db cr,lf,'FILE-WARNING' db cr,lf,'IBM' db cr,lf,'LOCAL-ECHO echoing (half-duplex)' ; db cr,lf,'RECEIVE parameter' ; db cr,lf,'SEND parameter' db cr,lf,'VT52-EMULATION$' stshlp db cr,lf,'PAD-CHAR' db cr,lf,'PADDING$' onhlp db cr,lf,'OFF ON$' yeshlp db cr,lf,'NO YES$' bdhlp db cr,lf,'300 1200 1800 2400 4800 9600$' inthlp db cr,lf,'? This message' db cr,lf,'C Close the connection' db cr,lf,'S Status of the connection' db cr,lf,'Typing the escape character will send it to the host' db cr,lf,cr,lf,'Command>$' locst db cr,lf,'Local echo on$' remst db cr,lf,'Local echo off$' vtemst db cr,lf,'VT52 emulation on$' novtst db cr,lf,'VT52 emulation off$' ibmst db cr,lf,'IBM on$' noibm db cr,lf,'IBM off$' b03st db cr,lf,'Baud rate is 300$' b12st db cr,lf,'Baud rate is 1200$' b18st db cr,lf,'Baud rate is 1800$' b24st db cr,lf,'Baud rate is 2400$' b48st db cr,lf,'Baud rate is 4800$' b96st db cr,lf,'Baud rate is 9600$' debon db cr,lf,'Debug mode on$' deboff db cr,lf,'Debug mode off$' flwon db cr,lf,'File Warning on$' flwoff db cr,lf,'File Warning off$' outlin db cr,lf,' CUCCA IBM-PC Kermit-86 V1.0', db ' Field Test Version',cr,lf db cr,lf,'Number of packets (hex)' db cr,lf,'Number of retries (hex)' db cr,lf,'File name $' delstr db 10O,' ',10O,10O,'$' ; Delete string. clrspc db ' ',10O,'$' ; Clear space. escspc db 10O,' ',10O,'$' ; Clear escape. clrlin db cr,'$' ; Clear line (just the cr part). prsp db ' $' ; Print a space. scrhi dw 0434H ; Err when 8th bit is on. scrrpr dw 0700H ; Prompt when Kermit ends. screrr dw 0600H ; Place for error msgs. scrfln dw 050CH ; Place for file name. scrnrt dw 0415H ; Place for number of retries. scrnp dw 0315H ; Place for number of packets. scrfr dw 0600H ; Rename file. scrst dw 0334H ; Place for status. scrsp dw 0800H ; Place for send packet. scrrp dw 0A00H ; Place for receive packet. ttab label word ; Table for cursor movement. ta dw curup ; Cursor up. tb dw curdwn ; Cursor down. tc dw currt ; Cursor right. td dw curlft ; Cursor left. te dw curskp ; Clear display. tf dw curskp ; Enter graphics mode. tg dw curskp ; Exit graphics mode. th dw curhm ; Cursor home. ti dw curup ; Reverse line feed. tj dw curscr ; Clear to end of screen. tk dw curln ; Clear to end of line. tl dw inslin ; Insert line. tm dw dellin ; Delete line. ; COMND tables comtab db 07H ; seven entries. db 07H,'CONNECT$' dw telnet db 04H,'EXIT$' dw exit db 04H,'HELP$' dw help db 07H,'RECEIVE$' dw read db 04H,'SEND$' dw send db 03H,'SET$' dw setcom db 06H,'STATUS$' dw status settab db 07H ; seven entries. db 04H,'BAUD$' dw baudst db 05H,'DEBUG$' dw debst db 06H,'ESCAPE$' dw escape db 0CH,'FILE-WARNING$' dw filwar db 03H,'IBM$' dw ibmset db 0AH,'LOCAL-ECHO$' dw lcal db 0EH,'VT52-EMULATION$' dw vt52em ontab db 02H ; Two entries. db 02H,'ON$' dw 01H db 03H,'OFF$' dw 00H yestab db 02H ; Two entries. db 02H,'NO$' dw 00H db 03H,'YES$' dw 01H bdtab db 06H ; Six entries. db 04H,'1200$' dw B1200 db 04H,'1800$' dw B1800 db 04H,'2400$' dw B2400 db 03H,'300$' dw B0300 db 04H,'4800$' dw B4800 db 04H,'9600$' dw B9600 ; COMND storage cmer00 db cr,lf,'?Program error Invalid COMND call$' cmer01 db cr,lf,'?Ambiguous$' cmer02 db cr,lf,'?Illegal input file spec$' cmer03 db cr,lf,'?Unrecognized instruction$' cmin00 db ' Confirm with carriage return$' cmcrlf db cr,lf,'$' cmstat db ? ; What is presently being parsed. cmaflg db ? ; Non-zero when an action char has been found. cmccnt db ? ; Non-zero if a significant char is found. cmsflg db ? ; Non-zero when the last char was a space. cmostp dw ? ; Old stack pointer for reparse. cmrprs dw ? ; Address to go to on reparse. cmprmp dw ? ; Address of prompt. cmptab dw ? ; Address of present keyword table. cmhlp dw ? ; Address of present help. cmdbuf db 80H DUP(?) ; Buffer for command parsing. cmfcb dw ? ; Pointer to FCB. cmfcb2 dw ? ; Pointer to position in FCB. cmcptr dw ? ; Pointer for next char input. cmdptr dw ? ; Pointer into the command buffer. cmsiz dw ? ; Size info of user input. cmkptr dw ? ; Pointer to keyword. cmsptr dw ? ; Place to save a pointer. cmchr db ? ; Save char when checking ambiguity. ; Program storage. oldstk dw ? ; Storage for system stack. oldsts dw ? ; System stack segment. ssp dw 0 ; Save SP in Telnet. bufhex dw 80H filsiz dd 0 ; Double word for filesize (in bytes.) eoflag db ? ; EOF flag; non-zero on EOF. debug db 0 ; Debugging mode (default off). hierr db 0 ; Non-ascii char (non-zero if yes). filflg db ? ; Non-zero when nothing in DMA buffer. ecoflg db 0 ; Local echo flag (default off). escflg db 0 ; Escape flag (start off). vtflg db 1 ; VT52 emulation flag (default on). flwflg db 0 ; File warning flag (default off). ibmflg db 0 ; IBM flag (default off). extflg db 0 ; Exit flag (default off). escchr db defesc ; Storage for the escape character. incnt dw ? ; Number of chars read in from port. chrcnt dw ? ; Number of chars in the file buffer. filcnt dw ? ; Number of chars left to fill. outpnt dw ? ; Position in packet. bufpnt dw ? ; Position in file buffer. fcbptr dw ? ; Position in FCB. datptr dw ? ; Position in packet data buffer. cbfptr dw ? ; Position in character buffer. pktptr dw ? ; Poistion in receive packet. siz dw ? ; Size of data from gtchr. baud dw B4800 ; Use default of 4800. spsiz db dspsiz ; Send packet size. rpsiz db drpsiz ; Receive packet size. stime db dstime ; Send time out. rtime db drtime ; Receive time out. spad db dspad ; Send padding. rpad db drpad ; Receive padding. spadch db dspadc ; Send padding char. rpadch db drpadc ; Receive padding char. seol db dseol ; Send EOL char. reol db dreol ; Receive EOL char. squote db dsquot ; Send quote char. rquote db drquot ; Receive quote char. pktnum dw ? ; Packet number. numpkt dw ? ; Total number of packets sent. numrtr dw ? ; Total number of retries. numtry db ? ; Number of tries on this packet. oldtry db ? ; Number of tries on previous packet. state db ? ; Present state of the automaton. packet db ?,?,?,? ; Packet (data is part of it). data db 5AH DUP(?) ; Data and checksum field of packet. recpkt db 60H DUP(?) ; Receive packet storage (use the following). filbuf db 60H DUP(?) ; Character buffer. fcb db 25H DUP(?) ; Use as our FCB. buff db 80H DUP(?) ; Use as our DAT. rdbuf db 80H DUP(?) cnt dw 0 temp dw 0 temp1 dw ? ; Temporary storage. temp2 dw ? temp3 dw ? temp4 dw ? argblk dw ? ; For subroutine arguments. argbk1 dw ? argbk2 dw ? argbk3 dw ? fcbnum dw ? ; Number of FCB's left in the list. DATAS ENDS ; End data segment MAIN SEGMENT PARA PUBLIC 'MAIN' START PROC FAR ASSUME CS:MAIN,DS:DATAS,SS:STACK,ES:NOTHING push ds ; Save system data area. sub ax,ax ; Get a zero. push ax ; Put zero return addr on stack. call cmblnk ; Clear the screen. call locate mov ax,datas ; Initialize DS. mov ds,ax sub ax,ax mov oldstk,sp ; Save old stack pointer. ; mov ax,ss ; mov oldsts,ax ; mov ax,stack ; Initialize SS. ; mov ss,ax ; mov sp,offset ss:stk ; sub ax,ax mov ah,prstr ; Print the version header. mov dx,offset versio int dos mov ah,1AH ; Set disk transfer address. mov dx,offset buff int dos mov dx,03FBH ; LCR -- Initialize baud rate. in al,dx mov bl,al or ax,80H out dx,al mov dx,03F8H mov ax,baud out dx,al inc dx mov al,ah out dx,al mov dx,03FBH mov al,bl out dx,al ; This is the main KERMIT loop. It prompts for and gets the users commands. kermit: mov dx,offset kerm call prompt ; Prompt the user. mov dx,offset comtab mov bx,offset tophlp mov ah,cmkey call comnd jmp kermt2 call bx ; Call the routine returned. jmp kermt3 cmp extflg,0 ; Check if the exit flag is set. jne finish ; If so jump to FINISH. jmp kermit ; Do it again. kermt2: mov ah,prstr mov dx,offset ermes1 ; Give an error. int dos jmp kermit kermt3: mov ah,prstr mov dx,offset ermes3 ; Give an error. int dos jmp kermit finish: ; mov ax,oldsts ; Restore the old stack. ; mov ss,ax mov sp,oldstk ret START ENDP ; These are some utility routines. ; Abort ABORT PROC NEAR mov state,'A' ; Otherwise abort. ret ABORT ENDP ; NAK NAK PROC NEAR mov ax,pktnum ; Get the packet number we're waiting for. mov argblk,ax mov argbk1,0 mov ah,'N' ; NAK that packet. call spack ret ; Go around again. NAK ENDP ; Position cursor for an error message. ERPOS PROC NEAR mov ah,2 mov bh,0 mov dx,screrr int bios ret ERPOS ENDP ; Position cursor for number of retries message. RTPOS PROC NEAR mov ah,2 mov bh,0 mov dx,scrnrt int bios ret RTPOS ENDP ; Print err message that found a non-standard-Ascii char in the file. BITERR PROC NEAR push bx mov ah,2 mov bh,0 mov dx,scrhi int bios mov ah,prstr mov dx,offset hibit int dos pop bx ret BITERR ENDP ; This routine sets up the data for init packet (either the ; Send_init or ACK packet). RPAR PROC NEAR mov ah,rpsiz ; Get the receive packet size. add ah,' ' ; Add a space to make it printable. mov [bx],ah ; Put it in the packet. mov ah,rtime ; Get the receive packet time out. add ah,' ' ; Add a space. mov 1[bx],ah ; Put it in the packet. mov ah,rpad ; Get the number of padding chars. add ah,' ' mov 2[bx],ah ; Put it in the packet. mov ah,rpadch ; Get the padding char. add ah,100O ; Uncontrol it. and ah,7FH mov 3[bx],ah ; Put it in the packet. mov ah,reol ; Get the EOL char. add ah,' ' mov 4[bx],ah ; Put it in the packet. mov ah,rquote ; Get the quote char. mov 5[bx],ah ; Put it in the packet. mov ah,06H ; Six pieces of data. ret RPAR ENDP ; This routine reads in all the send_init packet information. SPAR PROC NEAR mov temp4,ax ; Save the number of arguments. mov ah,[bx] ; Get the max packet size. sub ah,' ' ; Subtract a space. mov spsiz,ah ; Save it. mov ax,temp4 cmp al,3 ; Fewer than three pieces? jge spar1 ret ; If so we are done. spar1: mov ah,2[bx] ; Get the number of padding chars. sub ah,' ' mov spad,ah mov ax,temp4 cmp al,4 ; Fewer than four pieces? jge spar2 ret ; If so we are done. spar2: mov ah,3[bx] ; Get the padding char. add ah,100O ; Re-controlify it. and ah,7FH mov spadch,ah mov ax,temp4 cmp al,5 ; Fewer than five pieces? jge spar3 ret ; If so we are done. spar3: mov ah,4[bx] ; Get the EOL char. sub ah,' ' mov seol,ah mov ax,temp4 cmp al,6 ; Fewer than six pieces? jge spar4 ret ; If so we are done. spar4: mov ah,5[bx] ; Get the quote char. mov squote,ah ret SPAR ENDP ; Initialize buffers and clear line. INIT PROC NEAR call cmblnk call locate mov ah,prstr ; Put statistics headers on the screen. mov dx,offset outlin int dos call init1 ret INIT ENDP INIT1 PROC NEAR mov chrcnt,bufsiz ;* Number of chars left. mov bufpnt,offset buff ; Addr for beginning. ret INIT1 ENDP ; Clear out the old filename on the screen. CLRFLN PROC NEAR mov ah,2 mov bh,0 mov dx,scrfln int bios mov ax,0920H ; Clear out the old filename. mov bx,7 mov cx,12 int bios ret CLRFLN ENDP ; RECEIVE command READ PROC NEAR mov ah,cmcfm call comnd ; Get a confirm. jmp r call init ; Clear the line and initialize the buffers. mov numpkt,0 ; Set the number of packets to zero. mov numrtr,0 ; Set the number of retries to zero. mov pktnum,0 ; Set the packet number to zero. mov numtry,0 ; Set the number of tries to zero. call rtpos ; Position cursor. mov ax,numrtr call nout ; Write the number of retries. mov state,'R' ; Set the state to receive initiate. read2: mov ah,2 ; Position cursor. mov dx,scrst mov bh,0 int bios mov ah,prstr ; Be informative. mov dx,offset infms1 int dos mov ah,2 mov dx,scrnp mov bh,0 int bios mov ax,numpkt call nout ; Write the number of packets. mov ah,state ; Get the state. cmp ah,'D' ; Are we in the data send state? jne read3 call rdata jmp read2 read3: cmp ah,'F' ; Are we in the file receive state? jne read4 call rfile ; Call receive file. jmp read2 read4: cmp ah,'R' ; Are we in the receive initiate state? jne read5 call rinit jmp read2 read5: cmp ah,'C' ; Are we in the receive complete state? jne read6 mov ah,2 ; Position cursor. mov dx,scrst mov bh,0 int bios mov dx,offset infms3 ; Plus a little cuteness. mov ah,prstr int dos mov ah,2 mov dx,scrrpr ; Put prompt here. mov bh,0 int bios jmp rskp read6: mov ah,2 ; Position cursor. mov dx,scrst mov bh,0 int bios mov dx,offset infms4 ; Plus a little cuteness. mov ah,prstr int dos mov ah,2 mov dx,scrrpr mov bh,0 int bios jmp rskp READ ENDP ; Receive routines ; Receive init RINIT PROC NEAR mov ah,numtry ; Get the number of tries. cmp ah,imxtry ; Have we reached the maximum number of tries? jl rinit2 call erpos ; Position cursor. mov dx,offset ermes7 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. rinit2: inc ah ; Increment it. mov numtry,ah ; Save the updated number of tries. call rpack ; Get a packet. jmp nak ; Trashed packet: nak, retry. cmp ah,'S' ; Is it a send initiate packet? jne rinit3 ; If not see if its an error. mov ah,numtry ; Get the number of tries. mov oldtry,ah ; Save it. mov numtry,0 ; Reset the number of tries. mov ax,argblk ; Returned packet number. (Synchronize them.) inc ax ; Increment it. and ax,3FH ; Turn off the two high order bits. mov pktnum,ax ; Save modulo 64 of the number. mov bx,numpkt inc bx ; Increment the number of packets. mov numpkt,bx mov ax,argbk1 ; Get the number of arguments received. mov bx,offset data ; Get a pointer to the data. call spar ; Get the data into the proper variables. mov bx,offset data ; Get a pointer to our data block. call rpar ; Set up the receive parameters. xchg ah,al mov ah,0 mov argbk1,ax ; Store the returned number of arguments. mov ah,'Y' ; Acknowledge packet. call spack ; Send the packet. mov ah,'F' ; Set the state to file send. mov state,ah ret rinit3: cmp ah,'E' ; Is it an error packet? jne rinit4 call error rinit4: jmp abort RINIT ENDP ; Receive file RFILE PROC NEAR cmp numtry,maxtry ; Have we reached the maximum number of tries? jl rfile1 call erpos ; Position cursor. mov dx,offset ermes8 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. rfile1: inc numtry ; Save the updated number of tries. call rpack ; Get a packet. jmp nak ; Trashed packet: nak, retry. cmp ah,'S' ; Is it a send initiate packet? jne rfile2 ; No, try next type. cmp oldtry,imxtry ; Have we reached the maximum number of tries? jl rfil12 ; If not proceed. call erpos ; Position cursor. mov dx,offset ermes7 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. rfil12: inc oldtry ; Save the updated number of tries. mov ax,pktnum ; Get the present packet number. dec ax ; Decrement. cmp ax,argblk ; Is the packet's number one less than now? je rfil13 jmp nak ; No, NAK and try again. rfil13: call rtpos ; Position cursor. inc numrtr ; Increment the number of retries. mov ax,numrtr call nout ; Write the number of retries. mov numtry,0 ; Reset the number of tries. mov bx,offset data ; Get a pointer to our data block. call rpar ; Set up the parameter information. xchg ah,al mov ah,0 mov argbk1,ax ; Save the number of arguments. mov ah,'Y' ; Acknowledge packet. call spack ; Send the packet. ret rfile2: cmp ah,'Z' ; Is it an EOF packet? jne rfile3 ; No, try next type. cmp oldtry,maxtry ; Have we reached the maximum number of tries? jl rfil21 ; If not proceed. call erpos ; Position cursor. mov dx,offset ermes9 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. rfil21: inc oldtry ; Increment it. mov ax,pktnum ; Get the present packet number. dec ax ; Decrement. cmp ax,argblk ; Is the packet's number one less than now? je rfil24 jmp nak ; No, NAK and try again. rfil24: call rtpos ; Position cursor. inc numrtr ; Increment the number of retries mov ax,numrtr call nout ; Write the number of retries. mov numtry,0 mov argbk1,0 ; No data. (The packet number is in argblk.) mov ah,'Y' ; Acknowledge packet. call spack ; Send the packet. ret rfile3: cmp ah,'F' ; Start of file? jne rfile4 mov ax,argblk ; Get the packet number. cmp ax,pktnum ; Is it the right packet number? je rfil32 jmp nak ; No, NAK it and try again. rfil32: inc ax ; Increment the packet number. and ax,3FH ; Turn off the two high order bits. mov pktnum,ax ; Save modulo 64 of the number. inc numpkt ; Increment the number of packets. call gofil ; Get a file to write to. jmp abort call init1 ; Initialize all the buffers. mov ah,numtry ; Get the number of tries. mov oldtry,ah ; Save it. mov numtry,0 ; Reset the number of tries. mov argbk1,0 ; No data. (The packet number is in argblk.) mov ah,'Y' ; Acknowledge packet. call spack ; Send the packet. mov state,'D' ; Set the state to data receive. ret rfile4: cmp ah,'B' ; End of transmission. jne rfile5 mov ax,pktnum cmp ax,argblk ; Do we match? je rfil41 jmp nak ; No, NAK it and try again. rfil41: mov argbk1,0 ; No data. (Packet number already in argblk). mov ah,'Y' ; Acknowledge packet. call spack ; Send the packet. mov state,'C' ; Set the state to complete. ret rfile5: cmp ah,'E' ; Is it an error packet. jne rfile6 call error rfile6: jmp abort RFILE ENDP ; Receive data RDATA PROC NEAR cmp numtry,maxtry ; Get the number of tries. jl rdata1 call erpos ; Position cursor. mov dx,offset erms10 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. rdata1: inc numtry ; Save the updated number of tries. call rpack ; Get a packet. jmp nak ; Trashed packet: nak, retry. cmp ah,'D' ; Is it a data packet? jne rdata2 ; No, try next type. rdat11: mov ax,pktnum ; Get the present packet number. cmp ax,argblk ; Is the packet's number correct? jz rdat14 cmp oldtry,maxtry ; Have we reached the maximum number of tries? jl rdat12 ; If not proceed. call erpos ; Position cursor. mov dx,offset erms10 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. rdat12: inc oldtry ; Save the updated number of tries. dec pktnum ; Decrement present packet number. mov ax,pktnum cmp ax,argblk ; Is the packet's number one less than now? je rdat13 jmp nak ; No, NAK it and try again. rdat13: call rtpos ; Position cursor. inc numrtr ; Increment the number of retries mov ax,numrtr call nout ; Write the number of retries. mov numtry,0 ; Reset number of tries. mov argbk1,0 ; No data. (The packet number is in argblk.) mov ah,'Y' ; Acknowledge packet. call spack ; Send the packet. ret rdat14: inc ax ; Increment the packet number. and ax,3FH ; Turn off the two high order bits. mov pktnum,ax ; Save modulo 64 of the number. inc numpkt ; Increment the number of packets. mov ah,numtry ; Get the number of tries. mov oldtry,ah ; Save it. mov ax,argbk1 ; Get the length of the data. call ptchr jmp abort ; Unable to write out chars; abort. mov numtry,0 ; Reset the number of tries. mov argbk1,0 ; No data. (Packet number still in argblk.) mov ah,'Y' ; Acknowledge packet. call spack ; Send the packet. ret rdata2: cmp ah,'F' ; Start of file? jne rdata3 ; No, try next type. cmp oldtry,maxtry ; Have we reached the maximum number of tries? jl rdat21 ; If not proceed. call erpos ; Position cursor. mov dx,offset ermes8 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. rdat21: inc oldtry ; Save the updated number of tries. mov ax,pktnum cmp ax,argblk ; Is the packet's number one less than now? je rdat22 jmp nak ; No, NAK it and try again. rdat22: call rtpos ; Position cursor. inc numrtr ; Increment the number of retries mov ax,numrtr call nout ; Write the number of retries. mov numtry,0 ; Reset number of tries. mov argbk1,0 ; No data. (The packet number is in argblk.) mov ah,'Y' ; Acknowledge packet. call spack ; Send the packet. ret rdata3: cmp ah,'Z' ; Is it a EOF packet? jne rdata4 ; Try and see if its an error. mov ax,pktnum ; Get the present packet number. cmp ax,argblk ; Is the packet's number correct? je rdat32 jmp nak ; No, NAK it and try again. rdat32: inc ax ; Increment the packet number. and ax,3FH ; Turn off the two high order bits. mov pktnum,ax ; Save modulo 64 of the number. inc numpkt rdat33: mov bx,bufpnt ; Get the dma pointer. mov ax,80H sub ax,chrcnt ; Get the number of chars left in the DMA. mov cl,'Z'-100O ; Put in a ^Z for EOF. mov [bx],cl inc ax dec chrcnt mov cx,chrcnt mov temp,cx inc bx rdt3: inc ax cmp ax,80H jg rdat35 ; Pad till full. mov cl,0 ; Use nulls. mov [bx],cl inc bx jmp rdt3 rdat35: call outbuf ; Output the last buffer. jmp abort ; Give up if the disk is full. call fixfcb mov ah,closf ; Close up the file. mov dx,offset fcb int dos mov ah,numtry ; Get the number of tries. mov oldtry,ah ; Save it. mov numtry,0 ; Reset the number of tries. mov argbk1,0 ; No data. (The packet number is in argblk.) mov ah,'Y' ; Acknowledge packet. call spack ; Send the packet. mov state,'F' ret rdata4: cmp ah,'E' ; Is it an error packet. je rdata5 call error rdata5: jmp abort RDATA ENDP FIXFCB PROC NEAR mov bx,offset fcb+18 mov di,offset filsiz mov ax,[bx] mov [di],ax mov bx,offset fcb+16 mov ax,[bx] mov 2[di],ax mov ax,temp ; Get number of chars in last buffer full. sub filsiz+2,ax ; Get real file size. sbb filsiz,0 mov bx,offset fcb+18 mov di,offset filsiz mov ax,[di] mov [bx],ax mov bx,offset fcb+16 mov ax,2[di] mov [bx],ax ret FIXFCB ENDP ; Send command SEND PROC NEAR mov ah,cmifi ; Parse an input file spec. mov dx,offset fcb ; Give the address for the FCB. call comnd jmp r ; Give up on bad parse. send1: mov ah,cmcfm call comnd ; Get a confirm. jmp r ; Didn't get a confirm. send11: mov fcbnum,0 ; Zero the fcb list number. mov ah,sfirst ; Get the first file. mov dx,offset fcb int dos cmp al,0FFH ; Any found? jne send12 mov ah,prstr mov dx,offset crlf int dos mov ah,prstr mov dx,offset erms15 int dos ret ;* This must all be redone for MS-DOS. Hopefully wild card file stepping ;* in MS-DOS works. If so most of the following is unnecessary. send12: ;* call init ; Clear the line and initialize the buffers. mov pktnum,0 ; Set the packet number to zero. mov numtry,0 ; Set the number of tries to zero. mov numpkt,0 ; Set the number of packets to zero. mov numrtr,0 ; Set the number of retries to zero. call rtpos ; Position cursor. mov ax,0 call nout ; Write the number of retries. mov state,'S' ; Set the state to receive initiate. send2: mov ah,2 ; Position cursor. mov bh,0 mov dx,scrst int bios mov ah,prstr ; Be informative. mov dx,offset infms2 int dos mov ah,2 mov dx,scrnp mov bh,0 int bios mov ax,numpkt call nout ; Write the packet number. cmp state,'D' ; Are we in the data send state? jne send3 call sdata jmp send2 send3: cmp state,'F' ; Are we in the file send state? jne send4 call sfile ; Call send file. jmp send2 send4: cmp state,'Z' ; Are we in the EOF state? jne send5 call seof jmp send2 send5: cmp state,'S' ; Are we in the send initiate state? jne send6 call sinit jmp send2 send6: cmp state,'B' ; Are we in the eot state? jne send7 call seot jmp send2 send7: cmp state,'C' ; Are we in the send complete state? jne send8 mov ah,2 ; Position cursor. mov dx,scrst mov bh,0 int bios mov dx,offset infms3 ; Plus a little cuteness. mov ah,prstr int dos mov ah,2 mov dx,scrrpr mov bh,0 int bios jmp rskp send8: mov ah,2 ; Position cursor. mov dx,scrst mov bh,0 int bios mov dx,offset infms4 ; Plus a little cuteness. mov ah,prstr int dos mov ah,2 mov dx,scrrpr mov bh,0 int bios jmp rskp SEND ENDP ; Send routines ; Send initiate SINIT PROC NEAR cmp numtry,imxtry ; Have we reached the maximum number of tries? jl sinit2 call erpos mov dx,offset erms14 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. sinit2: inc numtry ; Save the updated number of tries. mov bx,offset data ; Get a pointer to our data block. call rpar ; Set up the parameter information. xchg ah,al mov ah,0 mov argbk1,ax ; Save the number of arguments. mov ax,numpkt ; Get the packet number. mov argblk,ax mov ah,'S' ; Send initiate packet. call spack ; Send the packet. call rpack ; Get a packet. jmp r ; Trashed packet don't change state, retry. cmp ah,'Y' ; ACK? jne sinit3 ; If not try next. mov ax,pktnum ; Get the packet number. cmp ax,argblk ; Is it the right packet number? je sini22 ret ; If not try again. sini22: inc ax ; Increment the packet number. and ax,3FH ; Turn off the two high order bits. mov pktnum,ax ; Save modulo 64 of the number. inc numpkt ; Increment the number of packets. mov ax,argbk1 ; Get the number of pieces of data. mov bx,offset data ; Pointer to the data. call spar ; Read in the data. mov ah,numtry ; Get the number of tries. mov oldtry,ah ; Save it. mov numtry,0 ; Reset the number of tries. mov state,'F' ; Set the state to file send. call getfil ; Open the file. jmp abort ; Something is wrong, die. ret sinit3: cmp ah,'N' ; NAK? jne sinit4 ; If not see if its an error. call rtpos ; Position cursor. inc numrtr ; Increment the number of retries mov ax,numrtr call nout ; Write the number of retries. mov ax,pktnum ; Get the present packet number. inc ax ; Increment. cmp ax,argblk ; Get the packet's number. je sini32 ret ; If not assume its for this packet, go again. sini32: mov numtry,0 ; Reset number of tries. mov state,'F' ; Set the state to file send. ret sinit4: cmp ah,'E' ; Is it an error packet. jne sinit5 call error sinit5: jmp abort SINIT ENDP ; Send file header SFILE PROC NEAR cmp numtry,maxtry ; Have we reached the maximum number of tries? jl sfile1 call erpos mov dx,offset erms14 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. sfile1: inc numtry ; Increment it. mov datptr,offset data ; Get a pointer to our data block. mov bx,offset fcb+1 ; Pointer to file name in FCB. mov fcbptr,bx ; Save position in FCB. mov cl,0 ; Counter for chars in file name. mov ch,0 ; Counter for number of chars in FCB. sfil11: cmp ch,8H ; Ninth char? jne sfil12 mov ah,'.' mov bx,datptr mov [bx],ah ; Put dot in data packet. inc bx mov datptr,bx ; Save new position in data packet. inc cl sfil12: inc ch cmp ch,0CH ; Twelve? jns sfil13 mov bx,fcbptr mov ah,[bx] ; Get char of filename. inc bx mov fcbptr,bx ; Save position in FCB. cmp ah,'!' ; Is it a good char? jl sfil11 ; If not, get the next. mov bx,datptr mov [bx],ah ; Put char in data buffer. inc cl ; Increment counter. inc bx mov datptr,bx ; Save new position. jmp sfil11 ; Get another char. sfil13: mov ch,0 mov argbk1,cx ; Save number of char in filename. mov bx,datptr mov ah,'$' mov [bx],ah ; Put dollar sign for printing. mov ah,2 mov dx,scrfln ; Put cursor in proper place. mov bh,0 int bios call clrfln mov ah,prstr mov dx,offset data ; Print file name. int dos mov ax,pktnum ; Get the packet number. mov argblk,ax mov ah,'F' ; File header packet. call spack ; Send the packet. call rpack ; Get a packet. jmp r ; Trashed packet don't change state, retry. cmp ah,'Y' ; ACK? jne sfile2 ; If not try next. mov ax,pktnum ; Get the packet number. cmp ax,argblk je sfil14 ret ; If not hold out for the right one. sfil14: inc ax ; Increment the packet number. and ax,3FH ; Turn off the two high order bits. mov pktnum,ax ; Save modulo 64 of the number. inc numpkt ; Increment the number of packets. mov ah,numtry ; Get the number of tries. mov oldtry,ah ; Save it. mov numtry,0 ; Reset the number of tries. ;* More file I/O. Anything to do with the CP/M FCB must be checked for MS-DOS. sfil15: mov ah,0 ; Get a zero. mov bx,offset fcb add bx,20H mov [bx],ah ; Set the record number to zero. mov eoflag,ah ; Indicate not EOF. mov ah,0FFH mov filflg,ah ; Indicate file buffer empty. call gtchr jmp sfil16 ; Error go see if its EOF. jmp sfil17 ; Got the chars, proceed. sfil16: cmp ah,0FFH ; Is it EOF? je sfl161 jmp abort ; If not give up. sfl161: mov ah,'Z' ; Set the state to EOF. mov state,ah ret sfil17: mov siz,ax ;* mov state,'D' ; Set the state to data send. ret sfile2: cmp ah,'N' ; NAK? jne sfile3 ; Try if error packet. call rtpos ; Position cursor. inc numrtr ; Increment the number of retries mov ax,numrtr call nout ; Write the number of retries. mov ax,pktnum ; Get the present packet number. inc ax ; Increment. cmp ax,argblk ; Is the packet's number one more than now? jz sfil14 ; Just as good as a ACK; go to the ACK code. ret ; If not go try again. sfile3: cmp ah,'E' ; Is it an error packet. jne sfile4 call error sfile4: jmp abort SFILE ENDP ; Send data SDATA PROC NEAR cmp numtry,maxtry ; Have we reached the maximum number of tries? jl sdata1 call erpos mov dx,offset erms14 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. sdata1: inc numtry ; Increment it. mov datptr,offset data ; Get a pointer to our data block. mov cbfptr,offset filbuf ; Pointer to chars to be sent. mov cx,1 ; First char. sdat11: mov bx,cbfptr mov ah,[bx] inc cbfptr mov bx,datptr mov [bx],ah ; Put the char in the data packet. inc datptr ; Save position in data packet. inc cx ; Increment the count. cmp cx,siz ; Have we transfered that many? jle sdat11 ; If not get another. mov ax,siz ; Number of char in char buffer. mov argbk1,ax mov ax,pktnum ; Get the packet number. mov argblk,ax mov ah,'D' ; Data packet. call spack ; Send the packet. call rpack ; Get a packet. jmp r ; Trashed packet don't change state, retry. cmp ah,'Y' ; ACK? jne sdata2 ; If not try next. mov ax,pktnum ; Get the packet number. cmp ax,argblk ; Is it the right packet number? jz sdat12 ret ; If not hold out for the right one. sdat12: inc ax ; Increment the packet number. and ax,3FH ; Turn off the two high order bits. mov pktnum,ax ; Save modulo 64 of the number. inc numpkt ; Increment the number of packets. mov ah,numtry ; Get the number of tries. mov oldtry,ah ; Save it. mov numtry,0 ; Reset the number of tries. call gtchr jmp sdat13 ; Error go see if its EOF. mov siz,ax ; Save the size of the data gotten. ret ;* File I/O. sdat13: cmp ah,0FFH ; Is it EOF? je sdt131 jmp abort ; If not give up. ;* sdt131: mov state,'Z' ; Set the state to EOF. ret sdata2: cmp ah,'N' ; NAK? jne sdata3 ; See if is an error packet. call rtpos ; Position cursor. inc numrtr ; Increment the number of retries mov ax,numrtr call nout ; Write the number of retries. mov ax,pktnum ; Get the present packet number. inc ax ; Increment. cmp ax,argblk ; Is the packet's number one more than now? jz sdat12 ; Just as good as ACK; goto ACK code. ret ; If not go try again. sdata3: cmp ah,'E' ; Is it an error packet. jne sdata4 call error sdata4: jmp abort SDATA ENDP ; Send EOF SEOF PROC NEAR cmp numtry,maxtry ; Have we reached the maximum number of tries? jl seof1 call erpos ; Position cursor. mov dx,offset erms14 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. seof1: inc numtry ; Increment it. mov ax,pktnum ; Get the packet number. mov argblk,ax mov argbk1,0 ; No data. mov ah,'Z' ; EOF packet. call spack ; Send the packet. call rpack ; Get a packet. jmp r ; Trashed packet don't change state, retry. cmp ah,'Y' ; ACK? jne seof2 ; If not try next. mov ax,pktnum ; Get the packet number. cmp ax,argblk ; Is it the right packet number? jz seof12 ret ; If not hold out for the right one. seof12: inc ax ; Increment the packet number. and ax,3FH ; Turn off the two high order bits. mov pktnum,ax ; Save modulo 64 of the number. inc numpkt ; Increment the number of packets. mov ah,numtry ; Get the number of tries. mov oldtry,ah ; Save it. mov numtry,0 ; Reset the number of tries. mov ah,closf ; Close the file. mov dx,offset fcb int dos ;* Check if successful call gtnfil ; Get the next file. jmp seof13 ; No more. mov state,'F' ; Set the state to file send. ret seof13: mov state,'B' ; Set the state to EOT. ret seof2: cmp ah,'N' ; NAK? jne seof3 ; Try and see if its an error packet. call rtpos ; Position cursor. inc numrtr ; Increment the number of retries mov ax,numrtr call nout ; Write the number of retries. mov ax,pktnum ; Get the present packet number. inc ax ; Increment. cmp ax,argblk ; Is the packet's number one more than now? jz seof12 ; Just as good as a ACK; go to the ACK code. ret ; If not go try again. seof3: cmp ah,'E' ; Is it an error packet? jne seof4 call error seof4: jmp abort SEOF ENDP ; Send EOT SEOT PROC NEAR cmp numtry,maxtry ; Have we reached the maximum number of tries? jl seot1 call erpos ; Position cursor. mov dx,offset erms14 mov ah,prstr int dos ; Print an error message. jmp abort ; Change the state to abort. seot1: inc numtry ; Increment it. mov ax,pktnum ; Get the packet number. mov argblk,ax mov argbk1,0 ; No data. mov ah,'B' ; EOF packet. call spack ; Send the packet. call rpack ; Get a packet. jmp r ; Trashed packet don't change state, retry. cmp ah,'Y' ; ACK? jne seot2 ; If not try next. mov ax,pktnum ; Get the packet number. cmp ax,argblk ; Is it the right packet number? jz seot12 ret ; If not hold out for the right one. seot12: inc ax ; Increment the packet number. and ax,3FH ; Turn off the two high order bits. mov pktnum,ax ; Save modulo 64 of the number. inc numpkt ; Increment the number of packets. mov ah,numtry ; Get the number of tries. mov oldtry,ah ; Save it. mov numtry,0 ; Reset the number of tries. mov state,'C' ; Set the state to file send. ret seot2: cmp ah,'N' ; NAK? jne seot3 ; Is it error. call rtpos ; Position cursor. inc numrtr ; Increment the number of retries mov ax,numrtr call nout ; Write the number of retries. mov ax,pktnum ; Get the present packet number. inc ax ; Increment. cmp ax,argblk ; Is the packet's number one more than now? jz seot12 ; Just as good as a ACK; go to the ACK code. ret ; If not go try again. seot3: cmp ah,'E' ; Is it an error packet. jne seot4 call error seot4: jmp abort SEOT ENDP ;* Here is the bulk of the file I/O. Good luck. ; File routines ; Output the chars in a packet. FILEIO PROC NEAR ptchr: mov temp1,ax ; Save the size. mov bx,offset data ; Beginning of received packet data. mov outpnt,bx ; Remember where we are. mov ch,rquote ; Quote char. ptchr1: dec temp1 ; Decrement # of chars in packet. jnl pt1 jmp rskp ; Return successfully if done. pt1: dec chrcnt ; Decrement number of chars in dta. jns ptchr2 ; Continue if space left. call outbuf ; Output it if full. jmp r ; Error return if disk is full. ptchr2: mov bx,outpnt ; Get position in output buffer. mov ah,[bx] ; Grab a char. inc bx mov outpnt,bx ; and bump pointer. cmp ah,ch ; Is it the quote char? jne ptchr4 ; If not proceed. mov ah,[bx] ; Get the quoted character inc bx mov outpnt,bx ; and bump pointer. dec temp1 ; Decrement # of chars in packet. mov dh,ah ; Save the char. and ah,80H ; Turn off all but the parity bit. mov dl,ah ; Save the parity bit. mov ah,dh ; Get the char. and ah,7FH ; Turn off the parity bit. cmp ah,ch ; Is it the quote char? jz ptchr3 ; If so just go write it out. mov ah,dh ; Get the char. add ah,40H ; Make it a control char again. and ah,7FH ; Modulo 128. ptchr3: or ah,dl ; Or in the parity bit. ptchr4: mov bx,bufpnt ; Destination buffer. mov [bx],ah ; Store it. inc bx mov bufpnt,bx ; Update the pointer jmp ptchr1 ; and loop to next char. ; output the buffer, reset bufpnt and chrcnt outbuf: push bx mov ah,writef ; The write code. mov dx,offset fcb int dos ; Write the record. pop bx cmp al,0 ; Successful. jz outbf1 cmp al,01 jz outbf0 call erpos mov ah,prstr mov dx,offset erms19 ; Record length exceeds dta. int dos ret outbf0: call erpos mov ah,prstr ; Tell about it. mov dx,offset erms11 ; Disk full error. int dos ret outbf1: mov bx,offset buff ; Addr for beginning. mov bufpnt,bx ; Store addr for beginning. mov ax,bufsiz-1 ; Buffer size. mov chrcnt,ax ; Number of chars left. jmp rskp ; Get the chars from the file. gtchr: mov ch,squote ; Keep quote char in c. mov ah,filflg ; Get the file flag. cmp ah,0 ; Is there anything in the DMA? jz gtchr0 ; Yup, proceed. mov cl,0 ; No chars yet. call inbuf jmp gtceof ; No more chars, go return EOF. gtchr0: mov al,spsiz ; Get the maximum packet size. sub al,5 ; Subtract the overhead. mov ah,0 mov temp1,ax ; Number of chars we're to get. mov bx,offset filbuf ; Where to put the data. mov cbfptr,bx ; Remember where we are. mov cl,0 ; No chars. gtchr1: dec temp1 ; Decrement the number of chars left. jns gtchr2 ; Go on if there is more than one left. mov al,cl ; Return the count in A. mov ah,0 jmp rskp gtchr2: mov ax,chrcnt dec ax jl gtchr3 mov chrcnt,ax jmp gtchr4 gtchr3: call inbuf ; Get another buffer full. jmp gtceof cmp chrcnt,0 jne gtchr4 sub cl,2 ; Don't count controllified Z. mov al,cl mov ah,0 jmp rskp gtchr4: mov bx,bufpnt ; Position in DMA. mov ah,[bx] ; Get a char from the file. inc bx mov bufpnt,bx mov dh,ah ; Save the char. and ah,80H ; Turn off all but parity. mov dl,ah ; Save the parity bit. mov ah,dh ; Restore the char. and ah,7FH ; Turn off the parity. cmp ah,' ' ; Compare to a space. jl gtchr5 ; If less then its a control char, handle it. cmp ah,del ; Is the char a delete? jz gtchr5 ; Go quote it. cmp ah,ch ; Is it the quote char? jne gtchr8 ; If not proceed. dec temp1 ; Decrement the char total remaining. mov bx,cbfptr ; Position in character buffer. mov [bx],ah ; Put the char in the buffer. inc bx mov cbfptr,bx inc cl ; Increment the char count. jmp gtchr8 gtchr5: or ah,dl ; Turn on the parity bit. cmp ah,('Z'-100O) ; Is it a ^Z? jne gtchr7 ; If not just proceed. mov ah,eoflag ; EOF flag set? cmp ah,0 jz gtchr6 ; If not just go on. mov bx,bufpnt mov ax,chrcnt mov dh,al ; Get number of chars left in DMA. gtch51: dec dh mov ah,dh jns gtch52 ; Any chars left? mov chrcnt,0 ; If not, say so. mov al,cl ; Return the count in A. mov ah,0 jmp rskp gtch52: mov ah,[bx] ; Get the next char. inc bx ; Move the pointer. cmp ah,('Z'-100O) ; Is it a ^Z? jz gtch51 ; If so see if they rest are. gtchr6: mov ah,('Z'-100O) ; Restore the ^Z. gtchr7: xchg ah,al mov ah,0 mov temp2,ax ; Save the char. dec temp1 ; Decrement char counter. mov bx,cbfptr ; Position in character buffer. mov [bx],ch ; Put the quote in the buffer. inc bx mov cbfptr,bx inc cl ; Increment the char count. mov ax,temp2 ; Get the control char back. xchg al,ah add ah,40H ; Make the non-control. and ah,7fH ; Modulo 200 octal. gtchr8: mov bx,cbfptr ; Position in character buffer. or ah,dl ; Or in the parity bit. mov [bx],ah ; Put the char in the buffer. inc bx mov cbfptr,bx inc cl ; Increment the char count. jmp gtchr1 ; Go around again. gtceof: cmp cl,0 ; Had we gotten any data? je gteof0 ; Nope. mov al,cl mov ah,0 jmp rskp gteof0: mov ah,0FFH ; Get a minus one. ret inbuf: mov ah,eoflag ; Have we reached the end? cmp ah,0 jz inbuf0 ret ; Return if set. inbuf0: push bx push cx mov bx,offset buff ; Set the r/w buffer pointer. mov bufpnt,bx mov ah,readf ; Read a record. mov dx,offset fcb int dos mov cx,filsiz cmp cx,0 ; Check for 128 chars or less left. jne inbuf1 ; Still have data left. mov ax,ds mov es,ax mov si,offset filsiz+2 mov di,offset bufhex cmps filsiz+2,es:bufhex ja inbuf1 ; More than 128 chars. mov eoflag,0FFH ; Set End-of-file. mov cx,filsiz+2 mov chrcnt,cx ; Return proper number of chars. mov filflg,0 ; Buffer not empty. pop cx pop bx jmp rskp inbuf1: sub filsiz+2,80H ; Sent another 128 chars. sbb filsiz,0 ; Account for the doubleword. mov al,80H ; Use as counter for number of chars read. pop cx pop bx cmp filflg,0 ; Ever used DMS? jnz inbf21 ; Nope, then don't change count. dec al ; Fix boundary error. inbf21: mov ah,0 ; Zero the flag (buffer not empty). mov chrcnt,ax ; Number of chars read from file. mov filflg,0 ; Buffer not empty. jmp rskp getfil: mov ah,0FFH mov filflg,ah ; Nothing in the DMA. mov ax,0 mov eoflag,ah ; Not the end of file. mov bx,offset fcb+0CH mov [bx],ax ; Zero the current block number. mov bx,offset fcb+0EH mov [bx],ax ; Ditto for Lrecl. mov bx,offset fcb+20H mov [bx],ah ; Zero the current record (of block). inc bx mov [bx],ax ; Same for record (of file). mov bx,offset fcb+23H mov [bx],ax mov ah,openf ; Open the file. mov dx,offset fcb int dos mov bx,offset fcb+18 ; File size in bytes (hi order word). mov di,offset filsiz ; Where to put the info. mov ax,[bx] mov [di],ax mov bx,offset fcb+16 ; Lo order word. mov ax,[bx] mov 2[di],ax sub filsiz+2,1 ; Don't count the ^Z. sbb filsiz,0 jmp rskp gtnfil: ret ; Just need label for now. ; Get the file name (including host to micro translation) gofil: mov bx,offset data ; Get the address of the file name. mov datptr,bx ; Store the address. mov bx,offset fcb+1 ; Address of the FCB. mov fcbptr,bx ; Save it. mov ax,0 mov temp1,ax ; Initialize the char count. mov temp2,ax mov si,offset fcb mov [si],ah ; Set the drive to default to current. mov ch,' ' gofil1: mov [bx],ch ; Blank the FCB. inc bx inc ah cmp ah,0BH ; Twelve? jl gofil1 gofil2: mov bx,datptr ; Get the NAME field. mov ah,[bx] inc bx mov datptr,bx cmp ah,'.' ; Seperator? jne gofil3 mov bx,offset fcb+9H mov fcbptr,bx mov ax,temp1 mov temp2,ax mov temp1,9H jmp gofil6 gofil3: cmp ah,0 ; Trailing null? jz gofil7 ; Then we're done. mov bx,fcbptr mov [bx],ah inc bx mov fcbptr,bx mov ax,temp1 ; Get the char count. inc ax mov temp1,ax cmp ax,8H ; Are we finished with this field? jl gofil2 gofil4: mov temp2,ax mov bx,datptr mov ah,[bx] inc bx mov datptr,bx cmp ah,0 jz gofil7 cmp ah,'.' ; Is this the terminator? jne gofil4 ; Go until we find it. gofil6: mov bx,datptr ; Get the TYPE field. mov ah,[bx] inc bx mov datptr,bx cmp ah,0 ; Trailing null? jz gofil7 ; Then we're done. mov bx,fcbptr mov [bx],ah inc bx mov fcbptr,bx inc temp1 ; Increment char count. cmp temp1,0CH ; Are we finished with this field? jl gofil6 gofil7: mov bx,datptr mov ah,'$' mov [bx],ah ; Put in a dollar sign for printing. mov ah,2 ; Position cursor. mov dx,scrfln mov bh,0 int bios call clrfln mov ah,prstr ; Print the file name. mov dx,offset data int dos mov ah,flwflg ; Is file warning on? cmp ah,0 jnz gf7x jmp gofil9 ; If not, just proceed. gf7x: mov ah,openf ; See if the file exists. mov dx,offset fcb int dos cmp al,0FFH ; Does it exist? jnz gf8x jmp gofil9 ; If not create it. gf8x: mov ah,2 ; Position cursor. mov dx,scrfr mov bh,0 int bios mov ah,prstr ; Inform the user we are renaming the file. mov dx,offset infms5 int dos mov ax,temp2 ; Get the number of chars in the file name. cmp ax,0 jne gofil8 mov ax,temp1 mov temp2,ax gofil8: mov ch,0 mov cl,al mov al,0 ; Says if first field is full. cmp cl,9H ; Is the first field full? jne gofl81 mov al,0FFH ; Set a flag saying so. dec cl gofl81: mov bx,offset fcb ; Get the FCB. add bx,cx ; Add in the character number. mov ah,'&' mov [bx],ah ; Replace the char with an ampersand. push ax push bx mov ah,openf ; See if the file exists. mov dx,offset fcb int dos pop bx cmp al,0FFH ; Does it exist? pop ax jz gofl89 ; If not create it. cmp al,0 ; Get the flag. jz gofl83 dec cl ; Decrement the number of chars. cmp cl,0 jz gofl88 ; If no more, die. jmp gofl81 gofl83: inc cl ; Increment the number of chars. cmp cl,9H ; Are we to the end? jl gofl81 ; If not try again ; else fail. gofl88: call erpos ; Position cursor. mov ah,prstr ; Tell the user that we can't rename it. mov dx,offset ermes4 int dos ret gofl89: mov bx,offset fcb+0CH ; Point past the end of the file name. mov dh,[bx] ; Save the present contents. mov ah,'$' mov [bx],ah ; Put in a dollar sign. push dx mov ah,prstr ; Print the file name. mov dx,offset fcb+1 int dos pop dx mov bx,offset fcb+0CH ; Restore over the dollar sign. mov [bx],dh gofil9: mov ah,delf ; Delete the file if it exists. mov dx,offset fcb int dos mov ax,0 mov si,offset fcb+0CH mov [si],ax ; Zero current block. mov si,offset fcb+0EH mov [si],ax ; Same for Lrecl. mov si,offset fcb+20H mov [si],ah ; Zero the current record (within block). inc si mov [si],ax ; Zero record (within file). mov si,offset fcb+23H mov [si],ax mov ah,makef ; Now create it. mov dx,offset fcb int dos cmp al,0FFH ; Is the disk full? je gf9x jmp rskp gf9x: call erpos ; Position cursor. mov ah,prstr ; If so tell the user. mov dx,offset erms11 int dos ret FILEIO ENDP ;* ; Packet routines ; Send_Packet ; This routine assembles a packet from the arguments given and sends it ; to the host. ; ; Expects the following: ; AH - Type of packet (D,Y,N,S,R,E,F,Z,T) ; ARGBLK - Packet sequence number ; ARGBK1 - Number of data characters ; Returns: +1 always SPKT PROC NEAR spack: push ax ; Save the packet type. mov bx,offset packet ; Get address of the send packet. mov ah,soh ; Get the start of header char. mov [bx],ah ; Put in the packet. inc bx ; Point to next char. mov ax,argbk1 ; Get the number of data chars. xchg ah,al add ah,' '+3 ; Real packet character count made printable. mov [bx],ah ; Put in the packet. inc bx ; Point to next char. mov cl,ah ; Start the checksum. mov ax,argblk ; Get the packet number. xchg ah,al add ah,' ' ; Add a space so the number is printable. mov [bx],ah ; Put in the packet. inc bx ; Point to next char. add cl,ah ; Add the packet number to the checksum. pop ax ; Get the packet type. mov [bx],ah ; Put in the packet. inc bx ; Point to next char. add cl,ah ; Add the type to the checksum. mov dx,argbk1 ; Get the packet size. spack2: cmp dx,0 ; Are there any chars of data? jz spack3 ; No, finish up. dec dx ; Decrement the char count. mov ah,[bx] ; Get the next char. inc bx ; Point to next char. add cl,ah ; Add the char to the checksum. cmp ah,0 jns spack2 mov hierr,0FFH ; set err flag. jmp spack2 ; Go try again. spack3: cmp hierr,0 je sp3x ; Nothing special to do. call biterr mov hierr,0 ; Reset. sp3x: mov ah,cl ; Get the character total. mov ch,cl ; Save here too (need 'cl' for shift). and ah,0C0H ; Turn off all but the two high order bits. mov cl,6 shr ah,cl ; Shift them into the low order position. mov cl,ch add ah,cl ; Add it to the old bits. and ah,3FH ; Turn off the two high order bits. (MOD 64) add ah,' ' ; Add a space so the number is printable. mov [bx],ah ; Put in the packet. inc bx ; Point to next char. mov ah,seol ; Get the EOL the other host wants. mov [bx],ah ; Put in the packet. inc bx ; Point to next char. mov ah,0 ; Get a null. mov [bx],ah ; Put in the packet. cmp debug,0 ; debug mode. je spack4 inc bx mov ah,'$' mov [bx],ah mov ah,2 mov dx,scrsp mov bh,0 int bios mov ah,prstr mov dx,offset spmes int dos mov dx,offset packet mov ah,prstr int dos ; debug end. spack4: call outpkt ; Call the system dependent routine. ret SPKT ENDP ; Write out a packet. OUTPKT PROC NEAR mov dh,spad ; Get the number of padding chars. outpk2: dec dh cmp dh,0 jl outpk3 ; If none left proceed. mov ah,spadch ; Get the padding char. call outchr ; Output it. jmp outpk2 outpk3: mov bx,offset packet ; Point to the packet. outlup: mov ah,[bx] ; Get the next character. cmp ah,0 ; Is it a null? jnz outlp2 ret outlp2: call outchr ; Output the character. inc bx ; Increment the char pointer. jmp outlup OUTPKT ENDP ;************************System Dependent**************************** ; Put a char in AH to the port. PORT PROC NEAR outchr: mov al,ah ; Char must be in al. mov cx,0 cmp ibmflg,0 je outch1 or al,080H outch1: mov ah,1 ; Output it. mov dx,0 int comm cmp ah,00H je outch3 loop outch1 ret outch3: ret ; cmp ibmflg,0 ; je outch2 ; Only wait for the IBM. ; cmp al,CR ; je outch2 ; mov cx,0A00H ;clup: loop clup ;outch2: ret ;************************System Dependent**************************** ; ; Get a char from the port and return in A. inchr: mov dx,03FDH ; Get port status. in al,dx test al,1 ; Data available? jnz inchr3 ; Read char ok. mov ah,constat ; Is a char on the console? int dos cmp al,0 jz inchr ; If not go look for another char. mov ah,conin ; Get the char. int dos mov ah,al cmp ah,cr ; Is it a carriage return? je inchr4 ; If not go look for another char. jmp inchr ; Wait for some kind of input. inchr4: ret inchr3: mov dx,03F8H ; Read in the char. in al,dx mov ah,al cmp ibmflg,0 je inchr5 and ah,7FH ; Turn off the parity bit. inchr5: jmp rskp PORT ENDP ;* ; Receive_Packet ; This routine waits for a packet arrive from the host. It reads ; chars until it finds a SOH. RPACK PROC NEAR mov ah,2 mov dx,scrst ; Position cursor. mov bh,0 int bios mov ah,prstr mov dx,offset infms0 int dos call inpkt ; Read up to a carriage return. jmp r ; Return bad. rpack0: call getchr ; Get a character. jmp r ; Hit the carriage return, return bad. cmp ah,soh ; Is the char the start of header char? jne rpack0 ; No, go until it is. rpack1: call getchr ; Get a character. jmp r ; Hit the carriage return, retuset infms0 cmp ah,soh ; Is the char the start of header char? jz rpack1 ; Yes, then go start over. mov cl,ah ; Start the checksum. sub ah,' '+3 ; Get the real data count. mov dh,ah ; Save it for later. mov al,ah ; Swap halves. mov ah,0 mov argbk1,ax ; Save the data count. call getchr ; Get a character. jmp r ; Hit the carriage return, return bad. cmp ah,soh ; Is the char the start of header char? jz rpack1 ; Yes, then go start over. add cl,ah ; Add it to the checksum. sub ah,' ' ; Get the real packet number. mov al,ah ; Swap halves. mov ah,0 mov argblk,ax ; Save the packet number. call getchr ; Get a character. jmp r ; Hit the carriage return, return bad. cmp ah,soh ; Is the char the start of header char? jz rpack1 ; Yes, then go start over. push ax ; Save the message type. add cl,ah ; Add it to the checksum. mov bx,offset data ; Point to the data buffer. rpack2: dec dh ; Any data characters? js rpack3 ; If not go get the checksum. call getchr ; Get a character. jmp r ; Hit the carriage return, return bad. cmp ah,soh ; Is the char the start of header char? jz rpack1 ; Yes, then go start over. mov [bx],ah ; Put the char into the packet. inc bx ; Point to the next character. add cl,ah ; Add it to the checksum. jmp rpack2 ; Go get another. rpack3: call getchr ; Get a character. jmp r ; Hit the carriage return, return bad. cmp ah,soh ; Is the char the start of header char? jz rpack1 ; Yes, then go start over. sub ah,' ' ; Turn the char back into a number. mov dh,cl ; Get the character total. and dh,0C0H ; Turn off all but the two high order bits. mov ch,cl mov cl,6 shr dh,cl ; Shift them into the low order position. mov cl,ch add dh,cl ; Add it to the old bits. and dh,3FH ; Turn off the two high order bits. (MOD 64) cmp dh,ah ; Are they equal? jz rpack4 ; If so finish up. mov dx,offset dimsg1 mov ah,prstr int dos ; Print a diagnostic message. ret rpack4: mov ah,0 mov [bx],ah ; Put a null at the end of the data. pop ax ; Get the type. jmp rskp RPACK ENDP INPKT PROC NEAR mov bx,offset recpkt ; Point to the beginning of the packet. mov incnt,0 inpkt2: call inchr ; Get a character. jmp r ; Return failure. mov [bx],ah ; Put the char in the packet. inc bx inc incnt cmp ah,reol ; Is it the EOL char? jne inpkt2 ; If not loop for another. cmp ibmflg,0 ; Is this the (dumb) IBM mainframe? jz inpkt4 ; If not then proceed. cmp incnt,1 ; Ignore bare CR. jne inpkt5 mov incnt,0 mov bx,offset recpkt jmp inpkt2 inpkt5: cmp state,'S' ; Check if this is the Send-Init packet. jz inpkt4 ; If so don't wait for the XON. inpkt3: call inchr ; Wait for the turn around char. jmp inpkt4 cmp ah,xon ; Is it the IBM turn around character? jne inpkt3 ; If not, go until it is. inpkt4: mov bx,offset recpkt mov pktptr,bx ; Save the packet pointer. jmp rskp ; If so we are done. INPKT ENDP GETCHR PROC NEAR push bx mov bx,pktptr ; Get the packet pointer. mov ah,[bx] ; Get the char. inc bx mov pktptr,bx pop bx ; Restore BX. cmp ah,reol ; Is it the EOL char? jne getcr2 ; If not return retskp. ret ; If so return failure. getcr2: jmp rskp GETCHR ENDP ; This is where we go if we get an error packet. ERROR PROC NEAR mov state,'A' ; Set the state to abort. call erpos ; Position the cursor. mov bx,argbk1 ; Get the length of the data. add bx,offset data ; Get to the end of the string. mov ah,'$' ; Put a dollar sign at the end. mov [bx],ah mov ah,prstr ; Print the error message. mov dx,offset data int dos ret ERROR ENDP ; This is the 'exit' command. It leaves KERMIT and returns to CP/M. EXIT PROC NEAR mov ah,cmcfm call comnd ; Get a confirm. jmp r mov extflg,1 ; Set the exit flag. jmp rskp ; Then return to system. EXIT ENDP ; This is the 'help' command. It gives a list of the commands. HELP PROC NEAR mov ah,cmcfm call comnd ; Get a confirm. jmp r mov ah,prstr ; Print a string to the console. mov dx,offset tophlp ; The address of the help message. int dos jmp rskp HELP ENDP source db 2048 DUP(?) ; Buffer for data from port. srcpnt dw 0 ; Pointer in buffer (DI). count dw 0 ; Number of chars in int buffer. savesi dw 0 ; Save SI register here. ; This is the CONNECT command. TELNET PROC NEAR mov ah,cmcfm call comnd ; Get a confirm. jmp r ; Didn't get a confirm. mov ah,prstr ; Output mov dx,offset crlf ; a crlf. int dos mov dx,offset tmsg1 int dos cld ; Do increment in string operations. cli ; Disable interrupts. xor ax,ax mov cx,ds ; Save DS in CX. mov ds,ax ; Use low core. mov bx,30H push [bx] ; Serial Card Interrupt vector. mov bx,32H push [bx] mov bx,6CH ; "break" interrupt vector. push [bx] mov bx,6EH push [bx] mov bx,30H mov ax,offset serint mov es,ax mov [bx],es ; Setup int addr. mov bx,32H mov [bx],cs mov bx,6CH mov ax,offset intret mov es,ax mov [bx],es ; ignore break int's (pt to "iret"). mov bx,6EH mov [bx],cs mov ds,cx mov ssp,sp ; Save SP to make an easy return. lea ax,cs:source mov cs:srcpnt,ax mov cs:savesi,ax ; Source of data starts at buffer head. mov cs:count,0 mov di,cs:srcpnt ; Address (for int) to put chars. mov ax,cs mov es,ax mov si,0 ; Place to get chars from. in al,21H ; Set up 8259 interrupt controller. and al,0EFH ; Enable INT4. out 21H,al mov dx,03FBH ; Set up baud, parity, etc. mov al,3 ; (baud set independently) out dx,al mov dx,03F9H ; Interrupt enable register. mov al,1 out dx,al mov dl,0FCH ; Enable int's from serial card. mov al,0BH out dx,al sti ; Enable interrupts. mov dl,0F8H in al,dx telnoe: call plup ; Char at port (type to console) ? cmp al,ESC jne telx jmp telesc telx: cmp al,DEL ; Don't bother with deletes. je telnoe cmp al,XOFF ; Skip all the following too. je telnoe cmp al,XON je telnoe cmp al,00H ; Null. je telnoe cmp al,BELL jne nobell call beep jmp telnoe nobell: mov ah,14 mov bx,0 int bios jmp telnoe TELNET ENDP EXTLN PROC NEAR cli ; Disable interrupts. ; push ax mov dx,03FCH mov al,3 ; Disable modem interrupts. out dx,al in al,21H ; Interrupt control. or al,10H ; Inhibit IRQ4. out 21H,al mov sp,ssp xor bx,bx mov cx,ds ; Save DS register. mov ds,bx ; Address low memory. ; pop ax mov bx,6EH pop [bx] mov bx,6CH pop [bx] mov bx,32H ; Restore old interrupt vectors. pop [bx] mov bx,30H pop [bx] mov ds,cx ; Restore DS. xor bx,bx sti mov ah,prstr mov dx,offset tmsg2 int dos jmp rskp EXTLN ENDP ; *********** serial port interrupt routine ******** SERINT PROC NEAR push dx push ax push es push di cld mov di,cs:srcpnt ; Registers for storing data. mov ax,cs mov es,ax mov dx,03FDH ; Asynch status port. in al,dx test al,1 ; Data available? jz retint ; Nope. mov dl,0F8H in al,dx and al,7FH ; Only want 7 bits. jz retint ; Ignore nulls. cmp al,7FH ; Ignore rubouts, too. jz retint stosb ; Store char in buffer. lea ax,cs:source sub di,ax and di,7FFH ; Truncate buffer here. add di,ax inc cs:count retint: mov cs:srcpnt,di sti mov al,64H out 20H,al ;Send End-of-Interrupt to 8259. pop di pop es pop ax pop dx intret: iret SERINT ENDP PLUP PROC NEAR call prtchr ret ; Got a char. nop ; Use up three bytes. nop call conchr ; See if char at cons (type to port). jmp extln ; Go back to Kermit on micro. jmp plup PLUP ENDP ;************************System Dependent**************************** ;* These I/O routines are similar to those just above. PRTCHR PROC NEAR cmp cs:count,0 jnz prtch2 jmp rskp ; No data - check console. prtch2: cli ; Disable int's. mov cx,ds mov ax,cs mov ds,ax mov si,cs:savesi lodsb ; Get char from buffer. lea dx,cs:source sub si,dx and si,7FFH ; Truncate buffer after here. add si,dx dec cs:count mov cs:savesi,si mov ds,cx sti ; Renable int's. ret PRTCHR ENDP ; Generate a short beep. BEEP PROC NEAR mov al,10110110B ; Gen a short beep (long one losses data.) out timer+3,al ; Code snarfed from Technical Reference. mov ax,533H out timer+2,al mov al,ah out timer+2,al in al,port_b mov ah,al or al,03 out port_b,al sub cx,cx mov bl,1 beep0: loop beep0 dec bl jnz beep0 mov al,ah out port_b,al ret BEEP ENDP CONCHR PROC NEAR mov ah,1 ; Get keyboard status. int keyb jnz cnc0x jmp rskp cnc0x: mov ah,0 ; Read a char. int keyb cmp al,0 ; Special char (cntrl-break)? jnz nobrk ; Nope. cmp ah,3 ; 3 in ah means nul code. jz cnc1y ; Skip nulls. cmp ah,0 ; Cntrl-Break? jne cnc1y xor cx,cx mov dx,03fbH in al,dx or al,40H ; Set send-break bit out dx,al pause: loop pause xor al,40H out dx,al cnc1y: jmp rskp nobrk: mov dl,al ; Store char here. mov ah,escchr ; Get the escape char. cmp ah,dl ; Is it an escape char? jz intchr ; If so go process it. cmp ibmflg,0 je conch0 or dl,080H ; Turn on eighth bit. conch0: push dx call prtout ; Output the char to the port. pop dx mov ah,ecoflg ; Get the echo flag. cmp ah,0 ; Is it turned on? jnz cnc1x jmp rskp ; If not we're done here. cnc1x: and dl,7FH cmp dl,BS ; Backspace? je cnc2x cmp dl,CR ; Carriage return? je cnc2x cmp dl,BELL jne cnc2y call beep jmp rskp cnc2y: cmp dl,20H ; Is it a control char? jge cnc2x jmp rskp cnc2x: mov ah,dconio ; Direct console output. int dos ; Echo the char. jmp rskp CONCHR ENDP CONN PROC NEAR intchr: mov ah,dconio ; Direct console I/O. mov dl,0FFH ; Input. int dos ; Get a char. mov ah,al cmp ah,0 ; Is the char a null? jz intchr ; If so, go until we get a char. mov bh,ah ; Save the actual char. and ah,137O ; Convert to upper case. cmp ah,'C' ; Is it close? jne intch0 ret intch0: cmp ah,'S' ; Is it status? jnz inc0x jmp stat01 ; If so, jump to stat01 (it will return). inc0x: mov ah,bh ; Get the char. cmp ah,'?' ; Is it help? jne intch1 ; If not, go to the next check. mov dx,offset inthlp ; If so, get the address of the help message. mov ah,prstr ; Print it. int dos jmp intchr ; Get another char. intch1: mov ch,ah ; Put the char into another reg. mov ah,escchr ; Get the escape char. cmp ah,ch ; Is it the escape char? jne intch2 ; If not, go send a beep to the user. cmp ibmflg,0 je intc11 or ch,080H ; Turn on high order bit. intc11: mov dl,ch call prtout ; Output it. jmp rskp ; Return, we are done here. intch2: mov dl,'G'-100O ; Otherwise send a beep. mov ah,dconio int dos jmp rskp ;* Another similar I/O routine. ;************************System Dependent**************************** prtout: mov al,dl ; Char must be in al. mov dx,03f8H out dx,al ret CONN ENDP ;* TELESC PROC NEAR cmp vtflg,0 ; Is vt52 flag on? jne vt0 jmp telnoe ; Don't do escape stuff if it's off. vt0: call plup mov ah,al ; Get the char. cmp ah,'Y' ; Special char - move cursor. jne vt1 jmp movcur vt1: cmp ah,'A' ; Less than an 'A'? jl vtig ; Yes - ignore. cmp ah,'M'+1 ; Greater than 'M'? jns vtig ; Yes - ignore. mov al,'A' sub ah,al ; Else make into index. shl ah,1 mov bx,offset ttab ; Load base addr of table. mov cl,ah ; Move a into cx. mov ch,00H ; Zero out high byte. add bx,cx ; Double add index+offset. mov bx,[bx] ; Get address of routine to call. jmp bx vtig: ; Ignore escape sequence. push ax ; Push the char to be output. mov dl,esc ; Load an escape. mov ah,conout ; The function code int dos ; and the syscal. pop ax ; Restore the character mov dl,ah ; and move to output register. mov ah,conout ; The function int dos ; and the syscall. jmp telnoe ; Return home. TELESC ENDP TEL PROC NEAR movcur: call plup sub al,32 mov dh,al mov temp,dx ; Save row position here. call plup mov dx,temp ; Restore sub al,32 ; Comes with 37Q added on (& starts at 1). mov dl,al mov bh,0 mov ah,2 int bios jmp telnoe curup: mov ah,3 ; Cursor up function. mov bh,0 int bios cmp dh,0 je cup0 sub dh,1 mov ah,2 int bios cup0: jmp telnoe curdwn: mov ah,3 ; Cursor down. mov bh,0 int bios cmp dh,24 je cdn0 add dh,1 mov ah,2 int bios cdn0: jmp telnoe currt: mov ah,3 ; Cursor right. mov bh,0 int bios cmp dl,79 je crt0 add dl,1 mov ah,2 int bios crt0: jmp telnoe curlft: mov ah,3 ; Cursor left. mov bh,0 int bios cmp dl,0 je clt0 sub dl,1 mov ah,2 int bios clt0: jmp telnoe curskp: jmp vtig ; Ignore for now. curhm: call locate jmp telnoe curscr: mov ah,3 ; Clear to end of screen. mov bh,0 int bios cmp dx,0 jne csr0 call cmblnk jmp telnoe csr0: cmp dl,0 je csr1 push dx call curln pop dx add dh,1 mov dl,0 csr1: mov cx,dx mov dx,184FH mov bh,7 ; mov al,25 ; sub al,ch mov al,0 mov ah,7 int bios jmp telnoe curln: mov ah,3 ; Clear to end of line. mov bh,0 int bios ; Get current cursor position mov cx,dx mov dl,79 mov ah,7 mov al,0 mov bh,7 int bios jmp telnoe inslin: mov ah,3 ; Get cursor position. mov bh,0 int bios mov temp,dx ; Save here. mov cx,dx mov cl,0 ; Start at beginning of row. mov dx,184FH ; End at lower corner of screen. mov ax,0701H mov bh,7 int bios ; Scroll down one line. mov dx,temp ; Get back where we were. mov dl,0 mov ah,2 mov bh,0 int bios jmp telnoe dellin: mov ah,3 mov bh,0 int bios ; Get current cursor position. mov temp,dx ; Remember the place. mov ax,0601H ; Scroll up one line. mov cx,dx mov cl,0 ; Start at beginning of row. mov dx,184FH mov bh,7 int bios mov dx,temp mov dl,0 mov ah,2 mov bh,0 int bios jmp telnoe TEL ENDP ;* ; This is the SET command. SETCOM PROC NEAR mov dx,offset settab ; Parse a keyword from the set table. mov bx,offset sethlp mov ah,cmkey call comnd jmp r call bx jmp rskp SETCOM ENDP ; This is the ESCAPE character SET subcommand. ESCAPE PROC NEAR call cmgtch ; Get a char. jns es1 ; Terminator or no? and ah,7FH ; Turn off minus bit. cmp ah,'?' jne es0 esch: mov dx,offset eschlp mov ah,prstr int dos mov dx,offset crlf int dos mov dx,offset kerm int dos mov bx,cmdptr mov al,'$' mov [bx],al mov dx,offset cmdbuf int dos jmp repars es0: mov dx,offset escmes ; Print a message. mov ah,prstr int dos mov ah,conin int dos ; Get new escape char. mov ah,al cmp ah,'?' je esch cmp ah,cr jne es1 mov ah,prstr mov dx,offset ermes3 int dos ret es1: mov escchr,ah ; Save new value. ret ESCAPE ENDP ; This is the LOCAL echo SET subcommand. LCAL PROC NEAR mov dx,offset ontab mov bx,offset onhlp mov ah,cmkey call comnd jmp r push bx ; Save the parsed value. mov ah,cmcfm call comnd ; Get a confirm. jmp r ; Didn't get a confirm. pop bx mov ecoflg,bl ; Set the local echo flag. ret LCAL ENDP ; This is the VT52 emulation SET subcommand. VT52EM PROC NEAR mov dx,offset ontab mov bx,offset onhlp mov ah,cmkey call comnd jmp r push bx mov ah,cmcfm call comnd ; Get a confirm. jmp r ; Didn't get a confirm. pop bx mov vtflg,bl ; Set the VT52 emulation flag. ret VT52EM ENDP ; This is the SET IBM command. IBMSET PROC NEAR mov dx,offset ontab mov bx,offset onhlp mov ah,cmkey call comnd jmp r push bx mov ah,cmcfm call comnd ; Get a confirm. jmp r ; Didn't get a confirm. pop bx mov ibmflg,bl ; Set the IBM flag. ret IBMSET ENDP ; This is the SET File-Warning command. FILWAR PROC NEAR mov dx,offset ontab mov bx,offset onhlp mov ah,cmkey call comnd jmp r push bx mov ah,cmcfm call comnd ; Get a confirm. jmp r ; Didn't get a confirm. pop bx mov flwflg,bl ; Set the IBM flag. ret FILWAR ENDP ; Sets debugging mode on and off. DEBST PROC NEAR mov dx,offset ontab mov bx,offset onhlp mov ah,cmkey call comnd jmp r push bx mov ah,cmcfm call comnd ; Get a confirm. jmp r ; Didn't get a confirm. pop bx mov debug,bl ; Set the IBM flag. ret DEBST ENDP ; This function sets the baud rate. BAUDST PROC NEAR mov dx,offset bdtab mov bx,offset bdhlp mov ah,cmkey call comnd jmp r push bx mov ah,cmcfm call comnd ; Get a confirm. jmp r ; Didn't get one. pop bx mov baud,bx ; Set the IBM flag. mov dx,03FBH ; LCR in al,dx mov bl,al or ax,80H out dx,al mov dx,03F8H mov ax,baud out dx,al inc dx mov al,ah out dx,al mov dx,03FBH mov al,bl out dx,al ret BAUDST ENDP ; This is the STATUS command. STATUS PROC NEAR call stat0 jmp r jmp rskp STATUS ENDP STAT0 PROC NEAR mov ah,cmcfm call comnd ; Get a confirm. jmp r ; Didn't get a confirm. stat01: mov dx,offset locst ; Assume local echo on. cmp ecoflg,0 ; Is the local echo flag on? jnz stat1 mov dx,offset remst ; If not say so. stat1: mov ah,prstr ; Print it. int dos mov dx,offset vtemst ; Get address of the VT52 emulation string. cmp vtflg,0 ; Is the VT52 emulation flag on? jnz stat2 mov dx,offset novtst ; If not say so. stat2: mov ah,prstr ; Print it. int dos mov dx,offset ibmst ; Is IBM flag on? cmp ibmflg,0 jnz stat3 mov dx,offset noibm ; Say it's not. stat3: mov ah,prstr int dos mov dx,offset deboff ; Assume debug mode is off. cmp debug,0 je stat4 mov dx,offset debon stat4: mov ah,prstr int dos mov dx,offset flwon ; Assume file-warning on. cmp flwflg,0 jne stat5 mov dx,offset flwoff stat5: mov ah,prstr int dos mov dx,offset b48st ; Assume 4800 baud. cmp baud,B4800 jz stat9 mov dx,offset b12st cmp baud,B1200 jz stat9 mov dx,offset b18st cmp baud,B1800 jz stat9 mov dx,offset b24st cmp baud,B2400 jz stat9 mov dx,offset b96st cmp baud,B9600 jz stat9 mov dx,offset b03st stat9: mov ah,prstr int dos mov dx,offset cmcrlf ; Get the address of a crlf. mov ah,prstr ; Print it. int dos jmp rskp STAT0 ENDP ; Utility routines ; Jumping to this location is like retskp. It assumes the instruction ; after the call is a jmp addr. RSKP PROC NEAR pop bp add bp,3 push bp ret RSKP ENDP ; Jumping here is the same as a ret. R PROC NEAR ret R ENDP ; This routine prints the number in AX on the screen. ; (Thanks to Jeff Damens) NOUT PROC NEAR push bx ; Save some stuff. push cx push dx push ax mov bh,0 ; Don't print leading zeros. and ah,0F0H ; Only want high order nibble. mov cl,4 shr ah,cl call pdig ; Print the digit. pop ax ; Restore argument. and ah,0FH ; Just the low order nibble. call pdig mov ah,al and ah,0F0H ; Only want high order nibble. mov cl,4 shr ah,cl call pdig ; Print the digit. mov ah,al and ah,0FH ; Just the low order nibble. mov bh,0FFH ; Make sure at least one zero is printed. call pdig pop dx ; Restore some stuff. pop cx pop bx ret NOUT ENDP ; print the digit in register AH PDIG PROC NEAR push ax ; Save it. cmp ah,0 jne pdig2 cmp bh,0 jne pdig2 pop ax ret pdig2: mov bh,0FFH ; Set the print zero flag. cmp ah,10 ; Do we use digits or a-f? jl usedig ; Digit. add ah,'A'-10 ; Compute digit jmp havdig ; and proceed. usedig: add ah,'0' ; Convert to digit havdig: mov dl,ah mov ah,conout int dos pop ax ret PDIG ENDP ; This set of routines provides a user oriented way of parsing ; commands. It is similar to that of the COMND JSYS in TOPS-20. ; This routine prints the prompt in DE and specifies the reparse ; address. PROMPT PROC NEAR pop bx ; Get the return address. push bx ; Put it on the stack again. mov cmrprs,bx ; Save as addr to go to on reparse. mov bx,0 ; Clear out register. add bx,sp ; Get the present stack pointer. mov cmostp,bx ; Save for later restoral. mov cmprmp,dx ; Save pointer to the prompt. mov bx,offset cmdbuf mov cmcptr,bx ; Initialize the command pointer. mov cmdptr,bx mov ah,0 mov cmaflg,ah ; Zero the flags. mov cmccnt,ah mov cmsflg,0FFH mov ah,prstr mov dx,offset cmcrlf int dos mov ah,prstr ; Print the prompt. mov dx,cmprmp int dos ret PROMPT ENDP ; This address is jumped to on reparse. PARSE PROC NEAR repars: mov sp,cmostp ; new sp <-- old sp mov bx,offset cmdbuf mov cmdptr,bx mov ah,0FFH mov cmsflg,ah mov bx,cmrprs ; Get the reparse address. call bx ; Go there. ; This address can be jumped to on a parsing error. prserr: mov sp,cmostp ; Set new sp to old one. mov bx,offset cmdbuf mov cmcptr,bx ; Initialize the command pointer. mov cmdptr,bx mov ah,0 mov cmaflg,ah ; Zero the flags. mov cmccnt,ah mov cmsflg,0FFH mov ah,prstr mov dx,offset cmcrlf int dos mov ah,prstr ; Print the prompt. mov dx,cmprmp ; Get the prompt. int dos ;* Instead return to before the prompt call. mov bx,cmrprs call bx PARSE ENDP ; This routine parses the specified function in AH. Any additional ; information is in DX and BX. ; Returns +1 on success ; +4 on failure (assumes a JMP follows the call) CMND PROC NEAR comnd: mov cmstat,ah ; Save what we are presently parsing. call cminbf ; Get chars until an action or a erase char. mov ah,cmstat ; Restore 'ah' for upcoming checks. cmp ah,cmcfm ; Parse a confirm? jz cmcfrm ; Go get one. cmp ah,cmkey ; Parse a keyword? jnz cm1 jmp cmkeyw ; Try and get one. cm1: cmp ah,cmifi ; Parse an input file spec? jnz cm2 jmp cmifil ; Go get one. cm2: cmp ah,cmofi ; Output file spec? jnz cm3 jmp cmofil ; Go get one. cm3: mov ah,prstr ; Else give error. mov dx,offset cmer00 ; "?Unrecognized COMND call" int dos ret ; This routine gets a confirm. cmcfrm: call cmgtch ; Get a char. cmp ah,0 ; Is it negative (a terminator; a space or ; a tab will not be returned here as they ; will be seen as leading white space.) js cmcfr0 ret ; If not, return failure. cmcfr0: and ah,7FH ; Turn off the minus bit. cmp ah,esc ; Is it an escape? jne cmcfr2 mov ah,conout mov dl,bell ; Get a bell. int dos mov ah,0 mov cmaflg,ah ; Turn off the action flag. mov bx,cmcptr ; Move the pointer to before thee scape. dec bx mov cmcptr,bx mov cmdptr,bx dec cmccnt ; Decremrnt the char count. jmp cmcfrm ; Try again. cmcfr2: cmp ah,'?' ; Curious? jne cmcfr3 mov ah,prstr ; Print something useful. mov dx,offset cmin00 int dos mov ah,prstr mov dx,offset cmcrlf ; Print a crlf. int dos mov ah,prstr mov dx,cmprmp ; Reprint the prompt. int dos mov bx,cmdptr ; Get the pointer into the buffer. mov ah,'$' ; Put a $ there for printing. mov [bx],ah mov bx,cmcptr dec bx ; Decrement & save the buffer pointer. mov cmcptr,bx mov ah,prstr mov dx,offset cmdbuf int dos mov ah,0 ; Turn off the action flag. mov cmaflg,ah jmp repars ; Reparse everything. cmcfr3: cmp ah,ff ; Is it a form feed? jne cmcfr4 call cmblnk ; If so blank the screen. cmcfr4: jmp rskp ; This routine parses a keyword from the table pointed ; to in DX. The format of the table is as follows: ; ; addr: db n ; Where n is the # of entries in the table. ; db m ; M is the size of the keyword. ; db 'string$' ; Where string is the keyword. ; dw ab ; Where ab is data to be returned. ; ; The keywords must be in alphabetical order. cmkeyw: mov cmhlp,bx ; Save the help. mov cmptab,dx ; Save the beginning of keyword table. mov bx,dx mov ch,[bx] ; Get number of entries in table. inc bx mov dx,cmdptr ; Save command pointer. mov cmsptr,dx ; Save pointer's here. cmky1: cmp ch,0 ; Any commands left to check? jne cmky2 ret ; Fail if not. cmky2: dec ch mov cl,0 ; Keep track of how many chars read in so far. call cmgtch ; Get a char. cmp ah,0 ; Do we have a terminator? jns cmky2x jmp cmky4 ; Negative number means we do. cmky2x: inc bx ; Point to first letter of keyword. inc cl ; Read in another char. mov al,[bx] cmp ah,'a' ; Less than a? jl cmky21 ; If so, don't capitalize. cmp ah,'z'+1 ; More than z? jns cmky21 and ah,137O ; Capitalize the letter. cmky21: cmp ah,al je cmky3 jg cmky2y jmp cmky41 ; Fail if ah preceeds al alphabetically. cmky2y: jmp cmky6 ; Not this keyword - try the next. cmky3: inc bx ; We match here, how 'bout next char? mov al,[bx] cmp al,'$' ; End of keyword? jne cmky3x jmp cmky7 ; Succeed. cmky3x: mov dl,al ; Save al's char here. call cmgtch inc cl ; Read in another char. mov al,dl cmp ah,'a' jl cmky31 cmp ah,'z'+1 jns cmky31 and ah,137O cmky31: cmp ah,9BH ; Escape Recognition (escape w/minus bit on)? je cmky3y cmp ah,0A0H ; A space? je cmky3y cmp ah,8DH ; Carriage return? je cmky3y jmp cmky38 cmky3y: mov cmkptr,bx ; Save bx here. mov cmsiz,cx ; Save size info. mov cmchr,ah ; Save char for latter. call cmambg ; See if input is ambiguous or not. jmp cmky32 ; Succeeded (not ambiguous). mov ah,cmchr cmp ah,9BH ; Escape? je cmky3z jmp cmky41 ; Fail. cmky3z: mov ah,conout ; Else, ring a bell. mov dl,bell int dos mov bx,cmcptr ; Move pointer to before the escape. dec bx mov cmcptr,bx mov cmdptr,bx dec cmccnt ; Decrement char count. mov bx,cmkptr ; Failed - pretend user never typed .... mov cx,cmsiz ; ... in a char. dec cl ; Don't count the escape. dec bx mov cmaflg,0 ; Reset the action flag. jmp cmky3 ; Keep checking. cmky32: mov cx,cmsiz ; Restore info. mov bx,cmkptr ; Our place in the keyword table. cmp cmchr,0A0H ; Space? je cmky35 cmp cmchr,8DH ; Carriage return? je cmky35 dec cmcptr ; Pointer into buffer of input. mov dx,cmcptr cmky33: mov ah,[bx] ; Get next char in keyword. cmp ah,'$' ; Are we done yet? jz cmky34 mov di,dx mov [di],ah inc bx inc dx inc cmccnt jmp cmky33 cmky34: mov ah,' ' mov di,dx mov [di],ah ; Put a blank in the buffer. inc dx mov cx,cmcptr ; Remember where we were (for printing below). mov cmcptr,dx ; Update our pointers. mov cmdptr,dx mov ah,'$' mov di,dx mov [di],ah ; Add '$' for printing. mov ah,prstr mov dx,cx ; Point to beginning of filled in data. int dos inc bx ; Point to address we'll need. mov bx,[bx] mov cmaflg,0 ; Turn off action flag. jmp rskp cmky35: inc bx mov ah,[bx] ; Find end of keyword. cmp ah,'$' jne cmky35 inc bx mov bx,[bx] ; Address of next routine to call. ; mov cmaflg,0 ; Zero the action flag. jmp rskp cmky38: cmp ah,al jne cmky6 ; Go to end of keyword and try next. jmp cmky3 cmky4: and ah,7FH ; Turn off minus bit. cmp ah,'?' ; Need help? je cmky5 cmp ah,' ' ; Just a space - no error. je cmky51 cmp ah,cr je cmky51 cmp ah,tab je cmky51 cmp ah,esc ; Ignore escape? je cmky43 cmky41: mov ah,prstr mov dx,offset cmer03 int dos jmp prserr ; Parse error - give up. cmky43: mov ah,conout ; Ring a bell. mov dl,bell int dos mov bx,cmcptr dec bx mov cmcptr,bx mov cmdptr,bx dec cmccnt ; Don't count the escape. mov cmaflg,0 ; Reset action flag. inc ch ; Account for a previous 'dec'. jmp cmky1 ; Start over. cmky5: mov ah,prstr mov dx,cmhlp ; Print the help text. int dos mov dx,offset crlf int dos mov dx,offset kerm int dos mov bx,cmdptr ; Get pointer into buffer. mov al,'$' mov [bx],al ; Add dollar sign for printing. mov dx,offset cmdbuf int dos dec cmcptr ; Don't keep it in the buffer. dec cmccnt ; Don't conut it. mov cmaflg,0 ; Turn off the action flag. jmp repars cmky51: jmp prserr cmky6: inc bx ; Find end of keyword. mov al,[bx] cmp al,'$' jne cmky6 inc bx ; Beginning of next command. inc bx inc bx mov dx,cmsptr ; Get old cmdptr. mov cmdptr,dx ; Restore. mov cmsflg,0FFH jmp cmky1 ; Keep trying. cmky7: call cmgtch ; Get char. cmp ah,0 js cmky71 ; Ok if a terminator. dec bx jmp cmky6 ; No match - try next keyword. cmky71: inc bx ; Get necessary data. mov bx,[bx] cmp ah,9BH ; An escape? jne cmky72 mov ah,prstr mov dx,offset prsp ; Print a space. int dos mov di,cmcptr dec di mov ah,20H mov [di],ah ; Replace escape char with space. mov cmaflg,0 mov cmsflg,0FFH ; Pretend they typed a space. cmky72: jmp rskp ; See if keyword is unambiguous or not from what the user has typed in. cmambg: cmp ch,0 ; Any keywords left to check? jne cmamb0 ret ; If not then not ambiguous. cmamb0: inc bx ; Go to end of keyword ... mov al,[bx] ; So we can check the next one. cmp al,'$' jne cmamb0 add bx,4 ; Point to start of next keyword. dec cl ; Don't count escape. mov dx,cmsptr ; Buffer with input typed by user. cmamb1: mov ah,[bx] ; Keyword char. mov di,dx mov al,[di] ; Input char. cmp al,'a' ; Do capitalizing. jl cmam11 cmp al,'z'+1 jns cmam11 and al,137O cmam11: cmp ah,al ; Keyword bigger than input (alphabetically)? jle cmamb2 ; No - keep checking. ret ; Yes - not ambiguous. cmamb2: inc bx ; Advance one char. inc dx dec cl jnz cmamb1 jmp rskp ; Fail - it's ambiguous. cmifil: mov bx,dx ; Get the fcb address in bx. mov cmfcb,bx ; Save it. mov ch,0 ; Initialize char count. mov ah,0 mov [bx],ah ; Set the drive to default to current. inc bx mov cmfcb2,bx mov cl,' ' cmifi0: mov [bx],cl ; Blank the FCB. inc bx inc ah cmp ah,0BH ; Twelve? jl cmifi0 cmifi1: call cmgtch ; Get another char. cmp ah,0 ; Is it an action character. jns cmifi2 and ah,7FH ; Turn off the action bit. cmp ah,'?' ; A question mark? jne cmif12 mov al,0 mov cmaflg,al ; Blank the action flag. dec cmcptr ; Decrement the buffer pointer. dec cmccnt ; Decrement count. ; jmp cmifi8 ; Treat like any other character. mov ah,prstr mov dx,offset filhlp ; Help message. int dos mov dx,offset crlf int dos mov dx,offset kerm int dos mov bx,cmdptr mov al,'$' mov [bx],al ; Put in dollar sign for printing. mov dx,offset cmdbuf int dos jmp repars cmif12: cmp ah,esc ; An escape? jne cmif13 mov ah,0 mov cmaflg,ah ; Turn off the action flag. mov ah,conout mov dl,bell int dos ; Ring the bell. mov bx,cmcptr ; Move the pointer to before the escape. dec bx mov cmcptr,bx mov cmdptr,bx dec cmccnt ; Decrement char count. jmp repars cmif13: mov ah,ch ; It must be a terminator. cmp ah,0 ; Test the length of the file name. jnz cmf3x jmp cmifi9 ; If zero complain. cmf3x: cmp ah,0DH js cmf3y jmp cmifi9 ; If too long complain. cmf3y: jmp rskp ; Otherwise we have succeeded. cmifi2: cmp ah,'.' jne cmifi3 inc ch mov ah,ch cmp ah,1H ; Any chars yet? jnz cmf2x jmp cmifi9 ; No, give error. cmf2x: cmp ah,0AH ; Tenth char? js cmf2y jmp cmifi9 ; Past it, give an error. cmf2y: mov dl,9H mov dh,0 mov bx,cmfcb add bx,dx ; Point to file type field. mov cmfcb2,bx mov ch,9H ; Say we've gotten nine. jmp cmifi1 ; Get the next char. cmifi3: cmp ah,':' jne cmifi4 inc ch cmp ch,2H ; Is it in right place for a drive? jne cmifi9 ; If not, complain. mov bx,cmfcb2 sub bx,1 mov ah,[bx] ; Get the drive name. sub ah,'@' ; Get the drive number. mov cmfcb2,bx mov bx,cmfcb mov [bx],ah ; Put it in the fcb. jmp cmifi1 cmifi4: cmp ah,'*' jne cmifi7 mov ah,ch cmp ah,8H ; Is this in the name or type field? jz cmifi9 ; If its where the dot should be give up. jns cmifi5 ; Type. mov cl,8H ; Eight chars. jmp cmifi6 cmifi5: mov cl,0CH ; Three chars. cmifi6: mov bx,cmfcb2 ; Get a pointer into the FCB. mov ah,'?' mov [bx],ah ; Put a question mark in. inc bx mov cmfcb2,bx inc ch mov ah,ch cmp ah,cl jl cmifi6 ; Go fill in another. jmp cmifi1 ; Get the next char. cmifi7: cmp ah,'0' jl cmif8x cmp ah,'z'+1 jns cmif8x cmp ah,'A' ; Don't capitalize non-alphabetics. jl cmifi8 and ah,137O ; Capitalize. cmifi8: mov bx,cmfcb2 ; Get the pointer into the FCB. mov [bx],ah ; Put the char there. inc bx mov cmfcb2,bx inc ch jmp cmifi1 cmif8x: push es mov cx,ds mov es,cx ; Scan uses ES register. mov di,offset spchar ; Special chars. mov cx,20 ; Twenty of them. mov al,ah ; Char is in al. repnz scasb ; Search string for input char. cmp cx,0 ; Was it there? pop es jnz cmifi8 cmifi9: mov ah,prstr mov dx,offset cmer02 int dos ret cmofil: jmp cmifil ; For now, the same as CMIFI. cminbf: push dx push bx mov cx,dx ; Save value here too. mov ah,cmaflg ; Is the action char flag set? cmp ah,0 je cminb1 jmp cminb9 ; If so get no more chars. cminb1: inc cmccnt ; Increment the char count. mov ah,conin ; Get a char. int dos mov ah,al ; Keep char in 'ah'. mov bx,cmcptr ; Get the pointer into the buffer. mov [bx],ah ; Put it in the buffer. inc bx mov cmcptr,bx cmp ah,25O ; Is it a ^U? jne cminb2 cmnb12: mov ah,prstr mov dx,offset clrlin int dos mov ax,0920H ; Write spaces. mov bx,7 ; Clear the line. mov cx,80 int bios mov ah,prstr mov dx,cmprmp ; Print the prompt. int dos mov bx,offset cmdbuf mov cmcptr,bx ; Reset the point to the start. mov cmccnt,0 ; Zero the count. mov dx,cx ; Preserve original value of dx. jmp repars ; Go start over. cminb2: cmp ah,10O ; Or backspace? jz cminb3 cmp ah,del ; Delete? jne cminb4 mov ah,prstr ; Print the delete string. mov dx,offset delstr int dos cminb3: mov ah,cmccnt ; Decrement the char count by two. dec ah dec ah cmp ah,0 ; Have we gone too far? jns cmnb32 ; If not proceed. mov ah,conout ; Ring the bell. mov dl,bell int dos jmp cmnb12 ; Go reprint prompt and reparse. cmnb32: mov cmccnt,ah ; Save the new char count. mov ah,prstr ; Erase the character. mov dx,offset clrspc int dos mov bx,cmcptr ; Get the pointer into the buffer. dec bx ; Back up in the buffer. dec bx mov cmcptr,bx jmp repars ; Go reparse everything. cminb4: cmp ah,'?' ; Is it a question mark. jz cminb6 cmp ah,esc ; Is it an escape? jz cminb8 cmp ah,cr ; Is it a carriage return? jz cminb5 cmp ah,lf ; Is it a line feed? jz cminb5 cmp ah,ff ; Is it a formfeed? jne cminb7 call cmblnk call locate cminb5: mov ah,cmccnt ; Have we parsed any chars yet? cmp ah,1 jnz cminb6 jmp prserr ; If not, just start over. cminb6: mov ah,0FFH ; Set the action flag. mov cmaflg,ah jmp cminb9 cminb7: jmp cminb1 ; Get another char. cminb8: mov ah,prstr ; Don't print the escape char. mov dx,offset escspc int dos jmp cminb6 cminb9: pop bx pop dx ret cmgtch: push cx push bx push dx cmgtc1: mov ah,cmaflg cmp ah,0 ; Is it set. jne cmgt10 call cminbf ; If the action char flag is not set get more. cmgt10: mov bx,cmdptr ; Get a pointer into the buffer. mov ah,[bx] ; Get the next char. inc bx mov cmdptr,bx cmp ah,' ' ; Is it a space? jz cmgtc2 cmp ah,tab ; Or a tab? jne cmgtc3 cmgtc2: mov ah,cmsflg ; Get the space flag. cmp ah,0 ; Was the last char a space? jne cmgtc1 ; Yes, get another char. mov ah,0FFH ; Set the space flag. mov cmsflg,ah mov ah,' ' pop dx pop bx jmp cmgtc5 cmgtc3: mov al,0 mov cmsflg,al ; Zero the space flag. pop dx pop bx cmp ah,esc jz cmgtc5 cmp ah,'?' ; Is the user curious? jz cmgtc4 cmp ah,cr jz cmgtc4 cmp ah,lf jz cmgtc4 cmp ah,ff je cmgtc4 pop cx ret ; Not an action char, just return. cmgtc4: dec cmdptr cmgtc5: or ah,80H ; Make the char negative to indicate pop cx ret ; it is a terminator. CMND ENDP ; This routine blanks the screen. CMBLNK PROC NEAR ; This is stolen from the IBM example. mov cx,0 mov dx,184FH mov bh,7 mov ax,600H int bios ret CMBLNK ENDP ; Cursor control. LOCATE PROC NEAR mov dx,0 ; Go to top left corner of screen. mov bh,0 mov ah,2 int bios ret LOCATE ENDP MAIN ENDS ; End of code section. END START