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- ; CPXLNK.ASM
- ; KERMIT - (Celtic for "FREE")
- ;
- ; This is the CP/M-80 implementation of the Columbia University
- ; KERMIT file transfer protocol.
- ;
- ; Version 4.0
- ;
- ; Copyright June 1981,1982,1983,1984
- ; Columbia University
- ;
- ; Originally written by Bill Catchings of the Columbia University Center for
- ; Computing Activities, 612 W. 115th St., New York, NY 10025.
- ;
- ; Contributions by Frank da Cruz, Daphne Tzoar, Bernie Eiben,
- ; Bruce Tanner, Nick Bush, Greg Small, Kimmo Laaksonen, Jeff Damens, and many
- ; others.
- ;
- ; This file describes the areas used to communicate between KERMIT
- ; and the customizing overlay. It is included by the overlay.
- ; This file should be changed only to reflect changes in the
- ; system-independent portion of Kermit (enhancements, I hope).
- ;
- ; revision history:
- ;edit 8, 14-Sep-1990 by MF. Added variable "incflg" to hold incomplete-
- ; file status for SET INCOMPLETE-FILES command.
- ; edit 7: 8 April, 1987 by OBSchou. Added a new entry EXTERN to leap off to
- ; code written by the user to emulate any terminal they want. All
- ; characters are sent here in stead of conout during connect state.
- ; In due course, Ill trap all prtstrs and dconio as well.
- ;
- ; edit 6: May 30, 1986 by OBSchou. Added two more entries to the link area:
- ; first to point to a "family" string giving the family name of the
- ; system. If the older CP4SYS.ASM still has the code, then the
- ; string is null. Secondly, a JMP to give printer status (should be
- ; a BIOS function). If 0 then printer is ready, if 0ffh then printer
- ; busy. This makes version 4.07 incompatable with 4.05
- ;
- ; edit 5: February 6, 1985
- ; Added a storage variable, "PORT", for the port-in-use value
- ; required for the port status routine (same purpose as SPEED).
- ; Also moved the printer copy flag (PRNFLG:) into the commun-
- ; ications storage area so machine dependant overlay can access it.
- ; [Hal Hostetler]
- ; Also, replace assembly-time conditional "ffussy" with run-time
- ; switch (CJC).
- ;
- ; edit 4: August 21, 1984 (CJC)
- ; Define a use for the third word of the linkage section: it points
- ; to the version string for CP4SYS.ASM. Add flsmdm, to flush comm line
- ; on startup. Add bufadr and bufsec for multiple-sector buffer support.
- ; Shift the entry section up two bytes so we can exit cleanly from DDT.
- ;
- ; edit 3: August 3, 1984 (CJC)
- ; put "mover" in CP4SYS, so we can do a Z80 block move if so inclined.
- ;
- ; edit 2: July 10, 1984 (CJC)
- ; integrate Toad Hall changes for LASM compatibility: CP4LNK is linked
- ; by CP4DEF, and links CP4SYS.
- ;
- ; edit 1: May, 1984 (CJC)
- ; extracted from CPMBASE.M80 version 3.9; modifications are described
- ; in the accompanying .UPD file.
- ;
-
- ; Define the entry section. These addresses contain jumps to
- ; useful routines in KERMIT. To show we know what we're doing,
- ; we store the length of this section (entsiz) in our linkage
- ; section. I didn't use ORG and DS because I don't want zeroes
- ; generated for all the space between here and the actual start
- ; of cp4sys.
- entry equ 105H ; start of entry section
- kermit equ entry+0 ; reentry address
- nout equ entry+3 ; output HL in decimal
- entsiz equ 2*3 ; 2 entries, so far.
- ;
- ; End of entry section.
- ;
- ; Linkage section. This block (through the definition of lnksiz)
- ; is used by Kermit to reach the routines and data in the overlay.
- ; The section length is stored at the beginning of the overlay
- ; area so Kermit can verify that the overlay section is (a) present,
- ; (b) in the right place, and (c) the same size as (and therefore
- ; presumably the same as) the linkage section Kermit is expecting.
- ;
- ASEG
- ORG OVLADR
- ;
- lnkflg: dw lnksiz ; linkage information for consistency check.
- dw entsiz ; length of entry table, for same.
- dw swtver ; address of switcher. CPXSYS now a family
- dw family ;*NEW* for V4.08. Address of the family string
- ;
- ; hooks for system-dependent routines:
- ;
- ; Input/output routines.
- ;
- jmp selmdm ; select modem for I/O
- jmp outmdm ; output character in E to modem
- jmp inpmdm ; read character from modem. return character or 0 in A.
- jmp flsmdm ; flush pending input from modem
- jmp selcon ; select console for I/O
- jmp outcon ; output character in E to console
- jmp inpcon ; read char from console. return character or 0 in A
- jmp outlpt ; output character in E to printer
- jmp lptstat ;*NEW* get the status for the printer.
- ; 0=>ok, 0ffh=> not ok
- jmp 0 ;*NEW for 4.09* Terminal Emulation code (optional)
- ; If terminal is set to EXTERNAL and this address
- ; has been filled, then user uses their own code.
- xbdos: jmp 0 ;*NEW* Address of the BDOS trap in the independent
- ; code. Use this enty for BDOS calls if you want
- ; the printer handler to work properly.
-
- ; screen formatting routines
- jmp clrlin ; erase current line
- jmp clrspc ; erase current position (after backspace)
- jmp delchr ; make delete look like backspace
- jmp clrtop ; erase screen and go home
- ;
- ; these routines are called to display a field on the screen.
- jmp scrend ; move to prompt field
- jmp screrr ; move to error message field
- jmp scrfln ; move to filename field
- jmp scrnp ; move to packet count field
- jmp scrnrt ; move to retry count field
- jmp scrst ; move to status field
- jmp rppos ; move to receive packet field (debug)
- jmp sppos ; move to send packet field (debug)
- ;
- jmp sysinit ; program initialization
- jmp sysexit ; program termination
- jmp syscon ; remote session initialization
- jmp syscls ; return to local command level
- jmp sysinh ; help text for interrupt (escape) extensions
- jmp sysint ; interrupt (escape) extensions, including break
- jmp sysflt ; filter for incoming characters.
- ; called with character in E.
- jmp sysbye ; terminate remote session
- jmp sysspd ; baud rate change routine.
- ; called with value from table in DE
- jmp sysprt ; port change routine.
- ; called with value from table in HL
- jmp sysscr ; screen setup for file transfer
- ; called with Kermit's version string in DE
- jmp csrpos ; move cursor to row B, column C
- jmp sysspc ; calculate free space for current drive
- jmp mover ; do block move
- jmp prtstr ; *** NEW *** Link from system indep equivalent
- ;
- ; Local parameter values
- ;
- pttab: dw ttab ; points to local equivalents to VT52 escape sequences
- spdtab: dw spdtbl ; address of baud rate command table, or zero
- spdhlp: dw sphtbl ; address of baud rate help table, or zero
- prttab: dw prttbl ; address of port command table, or zero
- prthlp: dw prhtbl ; address of port help table, or zero
- timout: dw fuzval ; Fuzzy timeout.
- vtflg: db vtval ; VT52 emulation flag
- escchr: db defesc ; Storage for the escape character.
- speed: dw 0FFFFH ; storage for the baud rate (initially unknown)
- port: dw 0FFFFH ; storage for port value (initially unknown) [hh]
- prnflg: db 0 ; printer copy flag [hh]
- dbgflg: db 0 ; debugging flag
- ecoflg: db 0 ; Local echo flag (default off).
- flwflg: db 1 ; File warning flag (default on).
- ibmflg: db 0 ; IBM flag (default off).
- cpmflg: db 0 ;[bt] file-mode flag (default is DEFAULT)
- incflg: db 0 ;[MF]incomplete-file flag (default is DISCARD)
- parity: db defpar ; Parity.
- 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.
- chktyp: db dschkt ; Checksum type desired
- tacflg: ; TACtrap status:
- IF tac
- db tacval ; when non-zero, is current TAC intercept character;
- ENDIF;tac
- IF NOT tac
- db 0 ; when zero, TACtrap is off.
- ENDIF;tac
- tacchr: db tacval ; Desired TAC intercept character (even when off)
- bufadr: dw buff ; Address of possibly multi-sector buffer for I/O
- bufsec: db 1 ; Number of sectors big buffer can hold (0 means 256)
- ffussy: db 1 ; if nonzero, don't permit <>.,;?*[] in CP/M filespec.
- ; space used by directory command; here because space calculation is
- ; (operating) system-dependent
- bmax: ds 2 ; highest block number on drive
- bmask: ds 1 ; (records/block)-1
- bshiftf: ds 1 ; number of shifts to multiply by rec/block
- nnams: ds 1 ; counter for filenames per line
-
- lnksiz equ $-lnkflg ; length of linkage section, for consistency check.
-
- IF lasm ; If we're assembling with LASM,
- LINK CPXCOM ; get the next section.
- ENDIF;lasm
-