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; I218-4.ASM - MicroMint SB180 overlay file for IMP - 06/01/87
;
; HD64180 On-chip ASCII Port 0
;
; This version handles 6 ZMHz, 9 MHz or 12 MHz clock speed
;
; This file adapts the MicroMint SB180 computer to IMP.COM. This com-
; puter was featured in the September and October 1985 issues of BYTE
; magazine in Ciarcia's Circuit Cellar. The SB180 is an extremely com-
; pact (4" by 7") single board computer with 2 serial ports, 1 parallel
; printer port, 5"/8" disk controller, and 256K RAM as well as an expan-
; ion port for SASI/SCSI controllers, etc. It utilizes the new Hitachi
; HD64180 CMOS CPU, a VLSI chip with memory management, serial, DMA and
; timer functions on-chip. It's instruction set is upwardly compatible
; with the Z80.
;
;
; Edit this file for your preferences then follow the "TO USE:" example
; shown below. Some special HD64180 instructions are used, but any nor-
; mal 8080 or Z80 assembler may be used.
;
; Many terminals will clear the screen with a CTL-Z. If yours does, put
; a 1AH at CLEAR: (010AH). Many terminals use two characters, the first
; normally an ESC. For example, ESC *. In this case put '*' at CLEAR:
; (The ESC will automatically be typed with no CTL-character present.)
; If you don't know what your terminal uses, put a 0 at CLEAR: and IMP
; will scroll up 24 blank lines to clear the CRT for things like MENU,
; looking at the function key table, typing CTL-Z in command mode, etc.
;
; Use the "SET" command to change the baudrate when desired. The value
; at MSPEED controls the baudrate when the program is first called up.
;
; TO USE: First edit this file filling in answers for your own
; equipment. Then assemble with ZAS.COM or equivalent
; assembler. Then use MLOAD to merge into the main file:
;
; MLOAD IMP.COM=IMP.COM,I2MM-x.HEX
;
; = = = = = = = = = = = = = = = = = =
;
; 06/01/87 After being advised by Steven Mendelson that 6 MHz, 9MHz and
; v4 12 MHz versions are available, I called MicroMint and got
; the baud rate data for all those from Ken Davidson.
; - Irv Hoff
;
; 06/01/87 Improved the GOODBYE routine, added BREAK routine, needs
; v3 IMP245 to use it.
;
; 03/27/86 Modest changes to standardize appearance with other similar
; v2 overlays, other minor changes. Renamed to I2MM to avoid
; conflict with I2SB for Intertec Super Brain computer.
; - Irv Hoff
;
; 08/19/85 First version for the MicroMint SB180.
; v1 - Max Southall
;
; = = = = = = = = = = = = = = = = =
;
YES EQU 0FFH
NO EQU 0
;
;
; Select one of the following for your computer board
;
CLK6 EQU YES ; Yes if using 6 MHz clock
CLK9 EQU NO ; Yes if using 9 MHz clock
CKL12 EQU NO ; Yes if using 12 MHz clock
;
;
; Values shown are for a HD64180
;
PORT EQU 00H ; Your base port (data or status)
MDCTL1 EQU PORT+4 ; Modem status port
MDDATIN EQU PORT+8 ; Modem data in port
MDDATOUT EQU PORT+6 ; Modem data out port
MDRCV EQU 80H ; Modem receive ready
MDSND EQU 02H ; Modem send ready bit
MDTXE EQU 02H ; Modem send buffer empty, holding buffer empty
;
BAUDRP EQU PORT+2 ; HD64180 Port 0 ^B
;
IN0 EQU 38EDH ; Special Hitachi op code pair for 'A' reg.
OUT0 EQU 39EDH ; Special Hitachi op code pair for 'A' reg.
;
;
;-----------------------------------------------------------------------
;
ESC EQU '['-40H ; ^[ = Escape
BELL EQU 'G'-40H ; ^G = Bell character
LF EQU 'J'-40H ; ^J = Linefeed
NEXTRY EQU 'K'-40H ; ^K = Try next phone number, abort this try
CR EQU 'M'-40H ; ^M = Carriage return
CLEARSC EQU 'Z'-40H ; ^Z = Clears screen, command mode only
EOFCHAR EQU 'Z'-40H ; ^Z = End of file
;
;
ORG 0100H
;
;
DS 3 ; Skip the data area below
;
;
; These routines and equates are at the beginning of the program so
; they can be patched by a monitor or overlay file without re-assembling
; the program.
;
MSPEED: DB 5 ; 0=110 1=300 2=450 3=600 4=710 5=1200 103H
; 6=2400 7=4800 8=9600 9=19200 default
HS2400: DB NO ; Yes=2400 bps highest speed 104H
HS1200: DB YES ; Yes=1200 bps highest speed 105H
RACAL: DB NO ; Yes=Racal-Vadic 1200V or 2400V or 2400PA 106H
PROMODM:DB YES ; Yes=Prometheus ProModem 1200 bps 107H
RESVD1: DB NO ; Reserved for special modems 108H
RESVD2: DB NO ; Reserved for special modems 109H
;
;
CLEAR: DB 1AH ; Clear screen character (ESC not needed) 10AH
;
IF CLK6
CLOCK: DB 60 ; Clock speed in MHz x10, 25.5 MHz max. 10BH
ENDIF ; CLK6
IF CLK9
CLOCK: DB 90 ; Clock speed in MHz x10, 25.5 MHz max. 10BH
ENDIF ; CLK9
IF CLK12
CLOCK: DB 120 ; Clock speed in MHz x10, 25.5 MHz max. 10BH
ENDIF ; CLK12

; 20=2 MHh, 37=3.68 MHz, 40=4 MHz, etc.
BYTDLY: DB 2 ; 0=0 delay 1=10ms 5=50 ms - 9=90 ms 10CH
; default time to send character in ter-
; minal mode file transfer for slow BBS
CRDLY: DB 2 ; 0=0 delay 1=100 ms 5=500 ms - 9=900 ms 10DH
; default time for extra wait after CRLF
; in terminal mode file transfer
NOFCOL: DB 5 ; Number of directory columns shown 10EH
TCHPUL: DB 'T' ; T=tone, P=Pulse (Hayes 2400 modems) 10FH
;.....
;
;
ADDLFD: DB NO ; Yes=add LF after CR to send file in terminal 110H
; mode (normally added by remote echo)
CONVRUB:DB YES ; Yes=convert rub to backspace 111H
CRCDFLT:DB YES ; Yes=default to CRC checking 112H
IGNRCTL:DB YES ; Yes=CTL-chars above ^M not displayed 113H
;.....
;
;
EXTCHR: DB '['-40H ; ESC = preceeds local control character 114H
EXITCHR:DB 'E' ; Exit character 115H
FILESND:DB 'F' ; Send file when in terminal mode 116H
NOCONCT:DB 'N' ; Disconnect from phone line 117H
LOGCHR: DB 'L' ; Send logon 118H
LSTCHR: DB 'P' ; Toggle printer 119H
UNSAVCH:DB 'R' ; Close input text buffer 11AH
SAVECHR:DB 'Y' ; Open input text buffer 11BH
CLEARS: DB 'Z' ; Clears screen, terminal mode 11CH
BRKCHR: DB 'Q' ; Send a break tone 11DH
NODTR: DB NO ; YES if no DTR and need ATH0 to disconnect 11EH
;......
;
;
; Handles in/out ports for data and status
;
I$MDCTL1:
DW IN0 ; 11FH
DB MDCTL1 ; 121H
DW IN0 ; 122H
DB MDCTL1 ; 124H
RET ; 125H
DB 0,0,0 ; 126H
;
I$MDTXE:DW IN0 ; 129H
DB MDCTL1 ; 12BH
DW IN0 ; 12CH
DB MDCTL1 ; 12EH
RET ; 13FH
DB 0,0,0 ; 130H
;
I$MDDATP:
DW IN0 ; 133H
DB MDDATIN ; 135H
RET ; 136H
DB 0,0,0,0,0,0 ; 137H
;
O$MDDATP:
DW OUT0 ; 13DH
DB MDDATOUT ; 13FH
RET ; OUT modem data port 140H
DB 0,0,0,0,0,0 ; Spares if needed 141H
;.....
;
;
A$MDRCV:ANI MDRCV ; 147H
RET ; 149H
;
C$MDRCV:CPI MDRCV ; 14AH
RET ; 14CH
;
A$MDSND:ANI MDSND ; 14DH
RET ; 14FH
;
C$MDSND:CPI MDSND ; 150H
RET ; 152H
;
A$MDTXE:ANI MDTXE ; 153H
RET ; 155H
;
C$MDTXE:CPI MDTXE ; 156H
RET ; 158H
;.....
;
;
; Special exit vector, used by some computers to reset interrupt vectors
;
J$EXITVEC:
RET ; 159H
DB 0,0 ; 15AH
;.....
;
;
; Jump vectors needed by each overlay
;
J$GOODBYE:
JMP GOODBYE ; Disconnects modem by dropping DTR 15CH
J$INITMOD:
JMP INITMOD ; Initializes modem, autosets baudrate 15FH
J$STUPR:JMP STUPR ; SET routine to change baudrate 162H
J$SYSVR:JMP SYSVR ; Signon message 165H
;.....
;
;
; "AT" command strings, can be replaced in individual overlay if needed
;
J$STRNGA:
DS 3 ; 1200 bps "AT" string 168H
J$STRNG1:
DS 3 ; 2400 bps "AT" string 16BH
;
;
; Next fourteen lines should not be changed by user overlay as these go
; to specific locations in the main program, not in the overlay.
;
;
J$CMDSPL:
DS 3 ; Allows entry of baudrate on CMD line 16EH
J$CRLF: DS 3 ; Turns up one new line on display 171H
J$DIAL: DS 3 ; Start of dialing routine 174H
J$DSCONT:
DS 3 ; Terminates modem use 177H
J$GOLST:DS 3 ; Printer routine, needed by Apple //e 17AH
J$ILPRT:DS 3 ; Prints an inline string, 0 to end 17DH
J$INBUF:DS 3 ; Stores a keybd string for comparison 180H
J$INLNCP:
DS 3 ; Inline "compare strings" routine 183H
J$INMDM:DS 3 ; Max .1 sec wait for modem character 186H
J$RCVRSP:
DS 3 ; For 3801 I/O use (TV-803) 189H
J$SNDCHR:
DS 3 ; Sends a character to the modem 18CH
J$SNDSTR:
DS 3 ; Sends a string to the modem, $ to end 18FH
J$TIMER:DS 3 ; .1 second timer (amount in 'B' reg.) 192H
J$BREAK:JMP SENDBRK ; Break routine 195H
J$NEW2: DB 0,0,0 ; For future needs 198H
;.....
;
;
; For 2400 bps auto-stepdown units
;
MANUAL: DB 0 ; For manual selection flag 19BH
J$300: JMP OK300 ; Sets baudrate to 300 baud 19CH
J$1200: JMP OK1200 ; Sets baudrate to 1200 bps 19FH
J$2400: JMP OK2400 ; Sets baudrate to 2400 bps 1A2H
;.....
;
;
LOGPTR: DW LOGON ; Pointer to display LOGON message 1A5H
;
SYSVR: CALL J$ILPRT ; Display the following line 1A7H
DB 'Version for Systech/MicroMint SB180' ; 1AAH
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).
;
;-----------------------------------------------------------------------
;
; You can put in a message at this location which can be called up with
; (special character-L). You can put in several lines. End with a 0.
;
LOGON: DB 'This is a SB180 computer...',CR,LF,0
;
;-----------------------------------------------------------------------
;
; This routine sets a 300 ms break tone. It changes the baudrate to
; 38400 bps then sends enough ASCII null characters to consume 300 ms.
; (A null character is all spacing except for the stop bit.) At high
; speed this effectively gives a steady break tone. When finished it
; restores the baudrate to the original speed.
;
SENDBRK:
IF CLK6 OR CLK12
MVI A,BD38400 ; Select 38,400 bps
ENDIF ; CLK6 OR CLK12
;
IF CLK9
MVI A,BD19200 ; Select 19,200 bps
ENDIF ; CLK9
;
CALL LOAD1 ; Set output for this speed
;
IF CLK6 OR CLK12
LXI D,1150 ; Will take 300 ms at 38,400 bps
ENDIF ; CLK6 OR CLK12
;
IF CLK9
LXI D,575 ; Will take 300 ms at 19,200 bps
ENDIF ; CLK9
;
SEND1: XRA A ; ASCII null character
CALL J$SNDCHR ; Sends a character to the modem
DCX D ; One less to go
JNZ SEND1 ; If not zero, do another
;
JMP INITMOD ; Reset original speed
;.....
;
;
; This routine sets DTR low for 300 ms to disconnect the modem.
;
GOODBYE:
DW IN0
DB PORT
DW 0E7CBH ; Raise DTR (actually RTS)
DW OUT0
DB PORT
MVI B,3 ; Wait for 300 ms
CALL J$TIMER
DW IN0
DB PORT
DW 0A7CBH ; Reset DTR to normal
DW OUT0
DB PORT
RET
;.....
;
;
; Initialization -- sets baudrate
;
INITMOD:
LDA MSPEED ; Get the selected value
CPI 1 ; 300 bps
JZ OK300
CPI 5 ; 1200 bps
JZ OK1200
CPI 6 ; 2400 bps
JZ OK2400
CPI 8 ; 9600 bps
JZ OK9600
CPI 9
JZ OK19200
JMP STUPR1 ; Else ask what is wanted
;.....
;
;
; Setup routine to allow changing modem speed with the SET command.
;
STUPR: CALL J$CMDSPL ; Gives us CMDBUF+6
JNC STUPR2
;
STUPR1: CALL J$ILPRT
DB 'Input BPS (300, 1200, 2400, 9600, 19200): ',0
LXI D,BAUDBUF ; Point to new input buffer
CALL J$INBUF
CALL J$CRLF
LXI D,BAUDBUF+2
;
STUPR2: CALL J$INLNCP ; Compare BAUDBUF+2 with chars. below
DB '300',0
JNC OK300 ; Go if got match
CALL J$INLNCP
DB '1200',0
JNC OK1200
CALL J$INLNCP
DB '2400',0
JNC OK2400
CALL J$INLNCP
DB '9600',0
JNC OK9600
CALL J$INLNCP
DB '19200',0
JNC OK19200
CALL J$ILPRT ; All matches failed, tell operator
DB '=> Unknown entry',CR,LF,BELL,CR,LF,0
JMP STUPR1 ; Try again
;
OK300: MVI A,1 ; MSPEED 300 bps value
MVI B,BD300
JMP LOADBD
;
OK1200: MVI A,5
MVI B,BD1200
JMP LOADBD
;
OK2400: XRA A ; Reset to maximum auto-speed
STA MANUAL
MVI A,6
MVI B,BD2400
JMP LOADBD
;
OK9600: MVI A,8
MVI B,BD9600
JMP LOADBD
;
OK19200:MVI A,9
MVI B,BD19200
;
LOADBD: STA MSPEED ; Change time-to-send to match baudrate
MOV A,B ; Get baudrate byte
;
LOAD1: LHLD 1 ; Get BIOS JMP table start address
LXI D,61 ; Offset of IOTABLE from BIOS+3
DAD D
PUSH H
DW 0E1DDH ; (POP IX)
DW 77DDH ; Z80 op code
DB PORT+2
DW OUT0
DB BAUDRP
RET
;.....
;
;
; Baudrate table
;
IF CLK6
BD300 EQU 13
BD1200 EQU 5
BD2400 EQU 4
BD9600 EQU 2
BD19200 EQU 1
BD38400 EQU 0
ENDIF ; CLK6
;
IF CLK9
BD300 EQU 38
BD1200 EQU 36
BD2400 EQU 35
BD9600 EQU 33
BD19200 EQU 32
ENDIF ; CLK9
;
IF CLK12
BD300 EQU 14
BD1200 EQU 6
BD2400 EQU 5
BD9600 EQU 3
BD19200 EQU 2
BD38400 EQU 1
ENDIF ; CLK12
;
BAUDBUF:DB 10,0,0,0,0,0
DB 0,0,0,0,0,0
;
; end
;-----------------------------------------------------------------------
;
; NOTE: Must terminate prior to 0400H
;
END