; 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