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Assembly Source File | 1988-08-15 | 25.1 KB | 744 lines

name msxdm2 ; File MSXDM2.ASM ; Last modification: 20 April 1986 ; DECmate II MS DOS Kermit module ; Add global entry point vtstat for use by Status in mssset. ; Also trimmed off trailing commas from publics. Joe R. Doupnik 12 March 1986 ; Add global procedures ihosts and ihostr to handle host initialization ; when packets are to be sent or received by us,resp. 24 March 1986 ; Add global procedure dtrlow (without worker serhng) to force DTR & RTS low ; in support of Kermit command Hangup. Says Not Yet Implemented. [jrd] ; Add small fixups in procedure coms. [jrd] ; Revise procedure outchr to use dos 2.x file handles rather than "punout" ; which defaults to the Printer! Make proc Clrbuf read from the comms port. ; Add global procedure Dumpscr, called by Ter in file msster, to dump screen ; to a file. Just does a beep for now. 13 April 1986 [jrd] ; In proc Outchr add override of xon from chkxon sending routine. ; This makes a hand typed Xoff supress the xon flow control character sent ; automatically as the receiver buffer empties. 20 April 1986 [jrd] PAGE 66,120 public serini, serrst, clrbuf, outchr, coms, vts, vtstat, dodel public ctlu, cmblnk, locate, lclini, prtchr, dobaud, clearl public dodisk, getbaud, beep public count, xofsnt, puthlp, putmod, clrmod, poscur public sendbr, term, machnam, setktab, setkhlp, showkey public ihosts, ihostr, dtrlow, dumpscr ; [jrd] include mssdef.h false equ 0 true equ 1 instat equ 6 rddev equ 3fH open equ 3dH ; external variables used: ; drives - # of disk drives on system ; flags - global flags as per flginfo structure defined in pcdefs ; trans - global transmission parameters, trinfo struct defined in pcdefs ; portval - pointer to current portinfo structure (currently either port1 ; or port2) ; port1, port2 - portinfo structures for the corresponding ports ; global variables defined in this module: ; xofsnt, xofrcv - tell whether we saw or sent an xoff. datas segment public 'datas' extrn drives:byte,flags:byte, trans:byte extrn portval:word, port1:byte, port2:byte extrn comand:byte, dmpname:byte ; [jrd] machnam db 'DECmate II MS-DOS 2.0$' erms20 db cr,lf,'?Warning: System has no disk drives$' ; [21a] erms40 db cr,lf,'?Warning: Unrecognized baud rate$' erms41 db cr,lf,'?Warning: Cannot open com port$' erms50 db cr,lf,'Error reading from device$' hnd1 db cr,lf,'Enter a file handle. Check your DOS manual if you are ' db cr,lf,'not certain what value to supply (generally 3).$' hnd2 db cr,lf,'Handle: $' hnderr db cr,lf,'Warning: Handle not known.' deverr db cr,lf,'Any routine using the communications port will' db cr,lf,'probably not work.$' hndhlp db cr,lf,'A four digit file handle $' dev1 db cr,lf,'Device: $' devhlp db cr,lf,'Name for your systems auxiliary port $' badbd db cr,lf,'Unimplemented baud rate$' noimp db cr,lf,'Command not implemented.$' hngmsg db cr,lf,' The phone should have hungup.',cr,lf,'$' ; [jrd] hnghlp db cr,lf,' The modem control lines DTR and RTS for the current' db ' port are forced low (off)' db cr,lf,' to hangup the phone. Normally, Kermit leaves them' db ' high (on) when it exits.' db cr,lf,'$' ; [jrd] rdbuf db 80 dup (?) ; temp buf [jrd] shkmsg db 'Not implemented.' shklen equ $-shkmsg setktab db 0 setkhlp db 0 gopos db esc,'[' rowp db 20 dup (?) crlf db cr,lf,'$' delstr db BS,' ',BS,'$' ; Delete string. [21d] clrlin db cr,'$' ; Clear line (just the cr part). clreol db ESC,'[K$' ; Clear line. clrseq db esc,'[H',esc,'[J$' ;clear screen home cursor. telflg db 0 ; non-zero if we're a terminal. xofsnt db 0 ; Say if we sent an XOFF. xofrcv db 0 ; Say if we received an XOFF. count dw 0 ; Number of chars in int buffer. prthnd dw 0 ; Port handle. prttab dw com2,com1 com1 db 'COM1',0 com2 db 'COM2',0 tmp db ?,'$' temp dw 0 temp1 dw ? ; Temporary storage. temp2 dw ? ; Temporary storage. ;;;[jrd]rdbuf db 20 dup(?) ; Buffer for input. prtstr db 20 dup(?) ; Name of auxiliary device. [27d] ; Entries for choosing communications port. [19b] comptab db 6 ; Number of options mkeyw '1',01H mkeyw '2',00H mkeyw 'COM1',01H mkeyw 'COM2',00H mkeyw 'DEVICE',02H mkeyw 'FILE-HANDLE',03H ourarg termarg <> datas ends code segment public 'code' extrn comnd:near, dopar:near, prserr:near, atoi:near, prompt:near extrn sleep:near ; [jrd] assume cs:code,ds:datas ; this is called by Kermit initialization. It checks the ; number of disks on the system, sets the drives variable ; appropriately. Returns normally. DODISK PROC NEAR mov ah,gcurdsk ; Current disk value to AL. int dos mov dl,al ; Put current disk in DL. mov ah,seldsk ; Select current disk. int dos ; Get number of drives in AL. mov drives,al ret DODISK ENDP ; Clear the input buffer. This throws away all the characters in the ; serial interrupt buffer. This is particularly important when ; talking to servers, since NAKs can accumulate in the buffer. ; Do nothing since we are not interrupt driven. Returns normally. CLRBUF PROC NEAR ret CLRBUF ENDP ; Clear to the end of the current line. Returns normally. CLEARL PROC NEAR push ax ; save regs [jrd] push dx mov ah,prstr mov dx,offset clreol int dos pop dx pop ax ret CLEARL ENDP ; Put the char in AH to the serial port. This assumes the ; port has been initialized. Should honor xon/xoff. Skip returns on ; success, returns normally if the character cannot be written. outchr: mov bp,portval cmp ds:[bp].floflg,0 ; Are we doing flow control. je outch2 ; No, just continue. xor cx,cx ; clear counter cmp ah,byte ptr [bp].flowc ; sending xoff? [jrd] jne outch1 ; ne = no mov xofsnt,false ; supress xon from chkxon buffer routine outch1: cmp xofrcv,true ; Are we being held? jne outch2 ; No - it's OK to go on. loop outch1 ; held, try for a while mov xofrcv,false ; timed out, force it off and fall thru. outch2: push dx ; Save register. mov al,ah ; Parity routine works on AL. call dopar ; Set parity appropriately. ; Begin revised output routine. [jrd] cmp prthnd,0 ; Got a handle yet? [27d] jne outch3 ; Yup just go on. [27d] call opnprt ; Else 'open' the port. [27d] outch3: push bx mov bx,prthnd ; port handle mov cx,1 ; one byte to write mov dx,offset temp ; place where data will be found mov byte ptr temp,al ; put data there mov ah,write2 ; dos 2 write to file/device int dos pop bx ; end of revised routine ;;; mov dl,al ;;; mov ah,punout ; Output char in DL to comm port. ;;; int dos pop dx jmp rskp ; This routine blanks the screen. Returns normally. CMBLNK PROC NEAR mov ah,prstr mov dx,offset clrseq ;erase the screen int dos ret CMBLNK ENDP ; Homes the cursor. Returns normally. LOCATE PROC NEAR mov dx,0 ; Go to top left corner of screen. jmp poscur LOCATE ENDP ; Write a line at the bottom of the screen... ; the line is passed in dx, terminated by a $. Returns normally. putmod proc near push dx ; preserve message mov dx,1800h ; now address line 24 call poscur pop dx ; get message back mov ah,prstr int dos ; write it out ret ; and return putmod endp ; clear the mode line written by putmod. Returns normally. clrmod proc near mov dx,1800h call poscur ; Go to bottom row. call clearl ; Clear to end of line. ret clrmod endp ; Put a help message on the screen. ; Pass the message in ax, terminated by a null. Returns normally. puthlp proc near push dx ; save regs [jrd] push si push ax ; preserve this mov ah,prstr mov dx,offset crlf int dos pop si ; point to string again puthl3: lodsb ; get a byte cmp al,0 ; end of string? je puthl4 ; yes, stop mov dl,al mov ah,dconio int dos ; else write to screen jmp puthl3 ; and keep going puthl4: mov ah,prstr mov dx,offset crlf int dos pop si ; [jrd] pop dx ret puthlp endp ; Set the baud rate for the current port, based on the value ; in the portinfo structure. Returns normally. DOBAUD PROC NEAR mov ah,prstr mov dx,offset noimp ; Say it's not implemented. int dos push bx ; [jrd] mov bx,portval mov [bx].baud,0FFFFH ; So it's not a recognized value. pop bx ; [jrd] ret ; Must be set before starting Kermit. DOBAUD ENDP ; Get the current baud rate from the serial card and set it ; in the portinfo structure for the current port. Returns normally. ; This is used during initialization. GETBAUD PROC NEAR ret ; Can't do this. GETBAUD ENDP ; Use for DOS 2.0 and above. Check the port status. If no data, skip ; return. Else, read in a char and return. ; Minor patch by [jrd] PRTCHR PROC NEAR push bx push cx push si push bp cmp prthnd,0 ; Got a handle yet? [27d] jne prtch0 ; Yup just go on. [27d] call opnprt ; Else 'open' the port. [27d] prtch0: call chkxon mov bx,prthnd mov al,instat mov ah,ioctl int dos or al,al jz prtch4 ; not ready... mov bx,prthnd mov ah,rddev mov cx,1 mov dx,offset temp int dos jnc prtch1 ; nc = no error. [jrd] cmp al,5 ; Error condition. je prt3x cmp al,6 ; Error condition je prt3x prtch1: mov al,byte ptr temp ; [jrd] mov bp,portval cmp ds:[bp].parflg,PARNON ; no parity? je prtch3 ; then don't strip and al,7fh ; else turn off parity prtch3: pop bp pop si pop cx pop bx ret prt3x: mov ah,prstr mov dx,offset erms50 int dos prtch4: pop bp pop si pop cx pop bx jmp rskp ; no chars... PRTCHR ENDP ; Local routine to see if we have to transmit an xon chkxon proc near push bx mov bx,portval cmp [bx].floflg,0 ; doing flow control? je chkxo1 ; no, skip all this cmp xofsnt,false ; have we sent an xoff? je chkxo1 ; no, forget it mov ax,[bx].flowc ; ah gets xon call outchr ; send it nop nop nop ; in case it skips mov xofsnt,false ; remember we've sent the xon. chkxo1: pop bx ; restore register ret ; and return chkxon endp ; IHOSTS - Initialize the host by sending XON, or equivalent, and enter the ; cycle of clear input buffer, wait 1 second, test if buffer empty then exit ; else repeat cycle. Requires that the port be initialized before hand. ; Ihosts is used by the local send-file routine just after initializing ; the serial port. ; 22 March 1986 [jrd] IHOSTS PROC NEAR push ax ; save the registers push bx push cx push dx mov bx,portval ; port indicator mov ax,[bx].flowc ; put Go-ahead flow control char in ah call outchr ; send it (release Host's output queue) nop ; outchr can do skip return nop nop ihosts1:call clrbuf ; clear out interrupt buffer mov ax,1 ; sleep for 1 second call sleep ; procedure sleep is in msscom.asm call prtchr ; check for char at port jmp ihosts1 ; have a char in al, repeat wait/read cycle nop ; prtchr does skip return on empty buffer pop dx ; empty buffer. we are done here. pop cx pop bx pop ax ret IHOSTS ENDP ; IHOSTR - initialize the remote host for our reception of a file by ; sending the flow-on character (XON typically) to release any held ; data. Called by receive-file code just after initializing the serial ; port. 22 March 1986 [jrd] IHOSTR PROC NEAR push ax ; save regs push bx push cx mov bx,portval ; port indicator mov ax,[bx].flowc ; put Go-ahead flow control char in ah call outchr ; send it (release Host's output queue) nop ; outchr can do skip return nop nop pop cx pop bx pop ax ret IHOSTR ENDP DTRLOW PROC NEAR ; Global proc to Hangup the Phone by making ; DTR and RTS low. mov ah,cmtxt ; allow text to be able to display help mov bx,offset rdbuf ; dummy buffer mov dx,offset hnghlp ; help message call comnd ; get a confirm jmp r ; not yet imp. call serhng ; drop DTR and RTS mov ah,prstr ; give a nice message ; not yet imp. mov dx,offset hngmsg mov dx,offset noimp ; for now int dos jmp rskp DTRLOW ENDP ; Hang up the Phone. Similar to SERRST except it just forces DTR and RTS low ; to terminate the connection. 29 March 1986 [jrd] ; Calling this twice without intervening calls to serini should be harmless. ; Returns normally. ; SERHNG is Not Yet Implemented. ; Send a break out the current serial port. Returns normally. SENDBR PROC NEAR push dx ;save the register to be used mov ah,03 ;class description 3 comm channel mov al,0bH ;send break to port mov dl,1cH ;send a 280 millisend break int 05fH ;call extended bios to do it pop dx ret SENDBR ENDP ; Position the cursor according to contents of DX: ; DH contains row, DL contains column. Returns normally. POSCUR PROC NEAR add dx,101H ;start at column 1,1 push ax ; [jrd] push bx push cx push di push es push dx cld mov ax,ds mov es,ax ;address right segment mov di,offset rowp ;row comes first mov al,dh mov ah,0 call nout ;store the characters into di mov al,';' ;separated with this stosb pop dx ;get back column number mov al,dl mov ah,0 call nout ;store as ascii data mov al,'H' ;terminator for dca stosb mov byte ptr [di],'$' ;terminate the line mov ah,prstr ;print string to msdos mov dx,offset gopos int dos pop es ;clean up the stack and exit pop di ; [jrd] pop cx pop bx pop ax ret POSCUR ENDP ; Delete a character from the terminal. This works by printing ; backspaces and spaces. Returns normally. DODEL PROC NEAR mov ah,prstr mov dx,offset delstr ; Erase weird character. int dos ret DODEL ENDP ; Move the cursor to the left margin, then clear to end of line. ; Returns normally. CTLU PROC NEAR mov ah,prstr mov dx,offset clrlin int dos call clearl ret CTLU ENDP ; Set the current port. COMS PROC NEAR mov dx,offset comptab mov bx,0 mov ah,cmkey call comnd jmp r push bx mov ah,cmcfm call comnd ; Get a confirm. jmp comx ; Didn't get a confirm. nop pop bx cmp bl,2 ; Do they want to set device name? [27d] je coms2 ; Yes go get name. [27d] jg coms3 ; Else pick up file handle. [27d] mov flags.comflg,bl ; Set the comm port flag. cmp flags.comflg,1 ; Using Com 1? jne coms0 ; Nope. mov ax,offset port1 mov portval,ax ret coms0: mov ax,offset port2 mov portval,ax ret comx: pop bx ret coms2: mov dx,offset dev1 ; Let user supply device name. call prompt mov ah,cmtxt mov bx,offset prtstr ; Put name here mov dx,offset devhlp call comnd jmp coms21 ; Did user type ^C. nop mov comand.cmstat,cmcfm ;simulate a confirm has been requested. [jrd] ;[jrd] mov al,0 ; Need a null ;[jrd] mov [bx],al ; To terminate string mov dx,offset prtstr ; Point to string mov ah,open ; Open port mov al,2 ; For reading and writing int dos jnc coms22 ; Success coms21: mov ah,prstr mov dx,offset erms41 int dos mov dx,offset deverr int dos ret coms22: mov prthnd,ax ; Save handle. ret coms3: mov dx,offset hnd2 ; Let user supply file handle. call prompt mov ah,cmtxt mov bx,offset rdbuf ; Where to put input. mov dx,offset hndhlp ; In case user wants help. call comnd jmp coms31 ; No go. nop cmp ah,4 ; Right amount of data? ja coms31 ; Too many chars. mov si,offset rdbuf call atoi ; Convert to real number jmp coms31 ; Keep trying. nop mov prthnd,ax ; Value returned in AX ret coms31: mov ah,prstr ; Else, issue a warning. mov dx,offset hnderr int dos ret ; Yes, fail. COMS ENDP ; Set heath emulation on/off. VTS PROC NEAR jmp notimp VTS ENDP ; Save the screen to a buffer and then append buffer to a disk file. [jrd] ; Default filename is Kermit.scn; actual file can be a device too. Filename ; is determined by mssset and is passed as pointer dmpname. DUMPSCR PROC NEAR ; Dumps screen contents to a file. Just Beeps here call beep ; [jrd] ret DUMPSCR ENDP notimp: mov ah,prstr mov dx,offset noimp int dos jmp prserr VTSTAT PROC NEAR ; For Status display [jrd] ret ; no emulator status to display VTSTAT ENDP ; Initialize variables to values used by the generic MS DOS version. lclini: mov flags.vtflg,0 ; Don't to terminal emulation. mov prthnd,3 ; No handle yet. [27d][28a d.rice] ; call opnprt ; Get file handle for comm port. ret ; Get a file handle for the communications port. Use DOS call to get the ; next available handle. If it fails, ask user what value to use (there ; should be a predefined handle for the port, generally 3). The open ; will fail if the system uses names other than "COM1" or "COM2". opnprt: mov al,flags.comflg mov ah,0 mov si,ax shl si,1 ; double index mov dx,prttab[si] mov ah,open mov al,2 int dos jnc opnpr2 mov ah,prstr ; It didn't like the string. mov dx,offset erms41 int dos mov dx,offset hnd1 int dos opnpr0: mov dx,offset hnd2 ; Ask user to supply the handle. call prompt mov ah,cmtxt mov bx,offset rdbuf ; Where to put input. mov dx,offset hndhlp ; In case user wants help. call comnd jmp opnpr3 ; Maybe user typed a ^C. nop mov si,offset rdbuf call atoi ; Convert to real number jmp opnpr0 ; Keep trying. nop mov prthnd,ax ; Value returned in AX ret opnpr2: mov prthnd,ax ; Call succeeded. ret opnpr3: cmp flags.cxzflg,'C' ; Did user type a ^C? jne opnpr4 ; No, don't say anything. mov ah,prstr ; Else, issue a warning. mov dx,offset hnderr int dos opnpr4: ret ; Yes, fail. showkey: mov ax,offset shkmsg mov cx,shklen ret ; Initialization for using serial port. Returns normally. SERINI PROC NEAR cld ; Do increments in string operations call clrbuf ; Clear input buffer. ret ; We're done. SERINI ENDP ; Reset the serial port. This is the opposite of serini. Calling ; this twice without intervening calls to serini should be harmless. ; Returns normally. SERRST PROC NEAR ret ; All done. SERRST ENDP ; Produce a short beep. The PC DOS bell is long enough to cause a loss ; of data at the port. Returns normally. BEEP PROC NEAR mov dl,bell mov ah,dconio int dos ret BEEP ENDP ; ;put the number in ax into the buffer pointed to by di. di is updated. ; nout proc near mov dx,0 ;high order is always zero mov bx,10 div bx ;divide to get digit push dx ;save remainder till later or ax,ax ;test the quotient jz noutl ;zero, no more number call nout ;else call for rest of number noutl: pop ax ;get digit back add al,'0' ;make it displayable stosb ;drop it off ret ;and exit nout endp ; Dumb terminal emulator. Doesn't work too well above 1200 baud (and ; even at 1200 baud you sometimes lose the first one or two characters ; on a line). term proc near mov si,ax ; this is source mov di,offset ourarg ; place to store arguments mov ax,ds mov es,ax ; address destination segment mov cx,size termarg rep movsb ; copy into our arg blk term1: call prtchr jmp short term2 ; have a char... nop nop jmp short term3 ; no char, go on term2: push ax and al,7fh ; mask off parity for terminal mov dl,al mov ah,conout int dos ; go print it pop ax test ourarg.flgs,capt ; capturing output? jz term3 ; no, forget it call ourarg.captr ; else call the routine term3: mov ah,dconio mov dl,0ffh int dos jz term1 ; no character, go on cmp al,ourarg.escc ; escape char? je term4 ; yes, exit push ax ; save char mov ah,al ;[jrd] or ah,80H ; turn on hi bit so DOS doesn't interfere call outchr ; output the character nop nop nop pop ax test ourarg.flgs,lclecho ; echoing? jz term1 ; no, continue loop mov dl,al mov ah,dconio int dos jmp term1 ; else echo and keep going term4: ret term endp ; 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 code ends end