; M7MM-1.ASM -- Morrow Multi-I/O overlay for MDM7xx 11/11/83
;
; This overlay adapts the MDM7xx program to use a Morrow Mult-I/O board
; and an external modem. The Mult-I/O board supports several users at
; the same port address in a fashion similar to bank selecting main
; memory. This program includes an initialization routine to select
; the baud rate but does not change the user (group) number which is
; set to group 1.
;
; You could look at other overlay files to see how the GOODBYE and/or
; SETUPR areas are handled. You could then adapt one of those, if ap-
; propriate for your equipment in this overlay. Some examples:
;
; "DP" Datapoint 1560 overlay using 8251 I/O and CTC timers for
; setting baud rates
; "H8" Heath H89 overlay for 8250 I/O and programmable baud rates
; "HZ" Zenith 120 overlay for 2661B initialization and baud rates
; "XE" Xerox 820II overlay for Z80-SIO intialization, etc.
;
; Edit this file for your preferences then follow the "TO USE:" example
; shown below.
;
; TO USE: First edit this file filling in answers for your own
; equipment. Then assemble with ASM.COM or equivalent
; assembler. Then use DDT to overlay the the results
; of this program to the original .COM file:
;
; A>DDT MDM7xx.COM
; DDT VERS 2.2
; NEXT PC
; 4300 0100
; -IM7MM-1.HEX (note the "I" command)
; -R ("R" loads in the .HEX file)
; NEXT PC
; 4300 0000
; -G0 (return to CP/M)
; A>SAVE 66 MDM7xx.COM (now have a modified .COM file)
;
; = = = = = = = = = = = = = = = = = =
;
; 11/11/83 - Renamed to M7MM-1.ASM, no changes - Irv Hoff
; 07/27/83 - Renamed to work with MDM712 - Irv Hoff
; 07/07/83 - Adapted for Morrow Multi-I/O - G. Smith
; 07/01/83 - Revised to work with MDM711 - Irv Hoff
; 07/01/83 - Revised to work with MDM710 - Irv Hoff
; 05/27/83 - Updated to work with MDM709 - Irv Hoff
; 05/15/83 - Revised to work with MDM708 - Irv Hoff
; 04/11/83 - Updated to work with MDM707 - Irv Hoff
; 04/04/83 - First version of this file - Irv Hoff
;
; = = = = = = = = = = = = = = = = =
;
BELL: EQU 07H ;bell
CR: EQU 0DH ;carriage return
ESC: EQU 1BH ;escape
LF: EQU 0AH ;linefeed
TAB: EQU 09H ;tab
BDOS: EQU 0005H
;
YES: EQU 0FFH
NO: EQU 0
;
;
; Change the following information to match your equipment
;
BASE: EQU 0F0H ;Base address for Mult-I/O board
GROUP: EQU 1 ;Group selection code
GRP$CTL: EQU BASE+7 ;Group selection port address
DLL: EQU BASE ;ACE baud rate divisor (LSB)
DLM: EQU BASE+1 ;ACE baud rate divisor (MSB)
IER: EQU BASE+1 ;ACE interrupt enable register
LCR: EQU BASE+3 ;ACE line control register
LSR: EQU BASE+5 ;ACE line status register
RBR: EQU BASE ;ACE receive buffer register
THR: EQU BASE ;ACE transmit hold register
DLAB: EQU 80H ;Divisor latch access bit
THRE: EQU 20H ;MODSNDB
DR: EQU 1 ;MODRCVB
WLS0: EQU 1 ;Word length select bit 0
WLS1: EQU 2 ;word length select bit 1
STB: EQU 4 ;stop bit count (2 stops)
IMASK: EQU 0 ;Interrupt mask -- disable all
;
MODDCDB: EQU 4 ;CARRIER DETECT BIT
MODDCDA: EQU 0 ;VALUE WHEN ACTIVE
MODRCVB: EQU 1 ;BIT TO TEST FOR RECEIVE
MODRCVR: EQU 1 ;VALUE WHEN READY
MODSNDB: EQU 20H ;BIT TO TEST FOR SEND
MODSNDR: EQU 20H ;VALUE WHEN READY
;
;
ORG 100H
;
;
; Change the clock speed to suit your system
;
DS 3 ;(for "JMP START" instruction)
;
PMMIMODEM: DB NO ;yes=PMMI S-100 Modem 103H
SMARTMODEM: DB NO ;yes=HAYES Smartmodem, no=non-PMMI 104H
TOUCHPULSE: DB 'T' ;T=touch, P=pulse (Smartmodem-only) 105H
CLOCK: DB 40 ;clock speed in MHz x10, 25.5 MHz max. 106H
;20=2 MHh, 37=3.68 MHz, 40=4 MHz, etc.
MSPEED: DB 1 ;0=110 1=300 2=450 3=600 4=710 5=1200 107H
;6=2400 7=4800 8=9600 9=19200 default
BYTDLY: DB 5 ;0=0 delay 1=10ms 5=50 ms - 9=90 ms 108H
;default time to send character in ter-
;minal mode file transfer for slow BBS.
CRDLY: DB 5 ;0=0 delay 1=100 ms 5=500 ms - 9=900 ms 109H
;default time for extra wait after CRLF
;in terminal mode file transfer
NOOFCOL: DB 5 ;number of DIR columns shown 10AH
SETUPTST: DB NO ;yes=user-added Setup routine 10BH
SCRNTEST: DB NO ;Cursor control routine 10CH
ACKNAK: DB YES ;yes=resend a record after any non-ACK 10DH
;no=resend a record after a valid-NAK
BAKUPBYTE: DB NO ;yes=change any file same name to .BAK 10EH
CRCDFLT: DB YES ;yes=default to CRC checking 10FH
TOGGLECRC: DB YES ;yes=allow toggling of CRC to Checksum 110H
CONVBKSP: DB NO ;yes=convert backspace to rub 111H
TOGGLEBK: DB YES ;yes=allow toggling of bksp to rub 112H
ADDLF: DB NO ;no=no LF after CR to send file in 113H
;terminal mode (added by remote echo)
TOGGLELF: DB YES ;yes=allow toggling of LF after CR 114H
TRANLOGON: DB YES ;yes=allow transmission of logon 115H
;write logon sequence at location LOGON
SAVCCP: DB NO ;no=do not save CCP 116H
LOCONEXTCHR: DB NO ;yes=local command if EXTCHR precedes 117H
;no=external command if EXTCHR precedes
TOGGLELOC: DB YES ;yes=allow toggling of LOCONEXTCHR 118H
LSTTST: DB YES ;yes=printer available on printer port 119H
XOFFTST: DB NO ;yes=checks for XOFF from remote while 11AH
;sending a file in terminal mode
XONWAIT: DB NO ;yes=wait for XON after CR while 11BH
;sending a file in terminal mode
TOGXOFF: DB YES ;yes=allow toggling of XOFF checking 11CH
IGNORCTL: DB YES ;yes=CTL-chars above ^M not displayed 11DH
EXTRA1: DB 0 ;for future expansion 11EH
EXTRA2: DB 0 ;for future expansion 11FH
BRKCHR: DB '@'-40H ;^@ = Send 300 ms. break tone 120H
NOCONNCT: DB 'N'-40H ;^N = Disconnect from the phone line 121H
LOGCHR: DB 'L'-40H ;^O = Send logon 122H
LSTCHR: DB 'P'-40H ;^P = Toggle printer 123H
UNSAVE: DB 'R'-40H ;^R = Close input text buffer 124H
TRANCHR: DB 'T'-40H ;^T = Transmit file to remote 125H
SAVECHR: DB 'Y'-40H ;^Y = Open input text buffer 126H
EXTCHR: DB '^'-00H ; ^ = Send next character 127H
;
;
DS 2 ; 128H
;
;
IN$MODCTL1: CALL MOD$SEL ;in modem control port 12AH
IN LSR
RET
;.....
;
;
DS 4
;
OUT$MODDATP: PUSH PSW ;out modem data port 134H
CALL MOD$SEL
POP PSW
OUT THR
RET
;.....
;
;
DS 2
;
IN$MODDATP: CALL MOD$SEL ;in modem data port 13EH
IN RBR
RET
;.....
;
;
DS 4
;
ANI$MODRCVB: ANI MODRCVB ! RET ;bit to test for receive ready 148H
CPI$MODRCVR: CPI MODRCVR ! RET ;value of rcv. bit when ready 14BH
ANI$MODSNDB: ANI MODSNDB ! RET ;bit to test for send ready 14EH
CPI$MODSNDR: CPI MODSNDR ! RET ;value of send bit when ready 151H
DS 6 ; 156H
;
OUT$MODCTL1: RET ! NOP ! NOP ;out modem control port #2 15AH
OUT$MODCTL2: RET ! NOP ! NOP ;out modem control port #1 15DH
;
LOGONPTR: DW LOGON ;for user message. 160H
DS 6 ; 162H
JMP$GOODBYE: JMP GOODBYE ; 168H
JMP$INITMOD: JMP INITMOD ;go to user written routine 16BH
RET ! NOP ! NOP ;(by-passes PMMI routine) 16EH
RET ! NOP ! NOP ;(by-passes PMMI routine) 171H
RET ! NOP ! NOP ;(by-passes PMMI routine) 174H
JMP$SETUPR: JMP SETUPR ; 177H
JMP$SPCLMENU: JMP SPCLMENU ; 17AH
JMP$SYSVER: JMP SYSVER ; 17DH
JMP$BREAK: JMP SENDBRK ; 180H
;
;
; Do not change the following six lines.
;
JMP$ILPRT: DS 3 ; 183H
JMP$INBUF DS 3 ; 186H
JMP$INLNCOMP: DS 3 ; 189H
JMP$INMODEM DS 3 ; 18CH
JMP$NXTSCRN: DS 3 ; 18FH
JMP$TIMER DS 3 ; 192H
;
;
; Routine to clear to end of screen. If using CLREOS and CLRSCRN, set
; SCRNTEST to YES at 010AH (above).
;
CLREOS: CALL JMP$ILPRT ; 195H
DB 16,0,0,0,0 ;Vector MT code for CLREOS 198H
RET ; 19DH
;
CLRSCRN: CALL JMP$ILPRT ; 19EH
DB 4,0,0,0,0 ;Vector MT code for CLRSCRN 1A1H
RET ; 1A6H
;
SYSVER: CALL JMP$ILPRT ; 1A7H
DB 'Computer with Morrow MIO board -- User #1'
DB CR,LF,0
RET
;.....
;
;
;-----------------------------------------------------------------------
;
; NOTE: You can change the SYSVER message to be longer or shorter. The
; end of your last routine should terminate by 0400H (601 bytes
; available after start of SYSVER) if using the Hayes Smartmodem
; or by address 0C00H (2659 bytes) otherwise.
;
;-----------------------------------------------------------------------
;
; You can put in a message at this location which can be called up with
; CTL-O if TRANLOGON has been set TRUE. You can use several lines if
; desired. End with a 0.
;
LOGON: DB 'How are you today?',CR,LF,0
;.....
;
;
; Add your own routine here to send a break tone to reset some time-share
; computers, if desired.
;
SENDBRK: RET
;.....
;
;
; Add your own routine here to put DTR low and/or send a break tone.
; Check other routines such as MDM709DP.ASM which is using this feature.
;
GOODBYE: RET
;.....
;
;
; You can use this area for any special initialization or setup you may
; wish to include. Each must stop with a RET. You can check the other
; available overlays for ideas how to write your own routines if that
; may be of some help.
;
INITMOD: LXI D,BAUD$MSG ;Point to baud selection message
MVI C,9 ;BDOS print string cmd
CALL BDOS ;Use BDOS to print baud message
LXI D,BAUD$BUF ;point to 1 char input buffer
MVI C,10 ;BDOS cmd to fill buffer from CON:
CALL BDOS
LDA CHOICE ;Get the character from the buffer
SUI 31H ;Subtract ASCII bias
JC INITMOD ;Input must be > zero
CPI 4 ;And less than 4
JNC INITMOD ;Now we have 0,1,2,or3 in 'A' Register.
RLC ;Mult by 2 for table offset
STA CHOICE ;save for later
MVI A,GROUP ;select group (user) number
OUT GRP$CTL
MVI A,DLAB ;Set data latch access bit
OUT LCR
LDA CHOICE ;get back offset into baud table
LXI H,INITBLE ;point to table base
ADD L ;add offset
MOV L,A
MOV A,M ;get low order byte for baud rate
OUT DLL
INX H ;point to next table entry
MOV A,M ;and send it to baud register
OUT DLM
MVI A,WLS0+WLS1+STB ;8 bit data word & 2 stop bits
OUT LCR
IN RBR ;clear flags
MVI A,IMASK ;set interrupt status (all disabled)
OUT IER
RET
;.....
;
;
SETUPR: RET
;.....
;
;
MOD$SEL: MVI A,GROUP ;Group select code
OUT GRP$CTL ;Group select register
MVI A,WLS0+WLS1+STB ;make sure DLAB is clear
OUT LCR
RET
;.....
;
;
; If using the Hayes Smartmodem this is unavailable without a special
; change.
;
SPCLMENU: RET
;
;
BAUD$MSG: DB CR,LF,TAB,'SELECT BAUD RATE (MIO user 1)'
DB CR,LF,TAB,TAB,'1. 300'
DB CR,LF,TAB,TAB,'2. 1200'
DB CR,LF,TAB,TAB,'3. 4800'
DB CR,LF,TAB,TAB,'4. 9600','$'
;
BAUD$BUF: DB 01,00
CHOICE: DB 00
;.....
;
;
; The initialization table is nothing more than a list of bytes to
; be send to the baud rate registers, in the same order as the choices
; in the baud message above. Note the MSB,LSB order within each entry.
;
INITBLE: DB 80H,01 ;300 baud divisor = 0180H
DB 60H,0 ;1200 baud divisor = 0C0H
DB 18H,0 ;4800 baud divisor = 018H
DB 0CH,0 ;9600 baud divisor = 00CH
;.....
;
;
; NOTE: MUST TERMINATE PRIOR TO 0400H (with Smartmodem)
; 0C00H (without Smartmodem)
;.....
;
END
;
MOD$SEL: MVI A,GROUP ;Group select code
OUT GRP$CTL ;Group select registe