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-
- ; I2GS-1.ASM - Apple IIGS overlay file for IMP - 05/17/88
- ;
- ; Internal Zilog 8530 SCC Serial Communications Controller
- ;
- ; This overlay file adapts Apple IIGS computers with Microsoft compatible
- ; CP/M cards and external 300/1200 or 300/1200/2400 bps modems to IMP.COM.
- ; It supports the following configurations:
- ;
- ; CP/M adapter cards:
- ; ------------------
- ; Microsoft Softcard
- ; Applied Engineering Z80+
- ; Advanced Logic Systems' Z-Engine
- ;
- ;-----------------------------------------------------------------------
- ;
- ; You will want to look this file over carefully. There are a number of
- ; options that you can use to configure the program to suit your taste.
- ;
- ; Edit this file for your preferences then follow the "TO USE:" example
- ; shown below.
- ;
- ; 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 ASM.COM or equivalent
- ; assembler. Then use MLOAD to merge into the main file:
- ;
- ; MLOAD IMP.COM=IMP.COM,I2GS-1.HEX
- ;
- ; - Notes by Irv Hoff W6FFC
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ; 05/17/88 Written for the Apple IIGS - John Wolf
- ; Heavily modified from Irv Hoff's //c overlay
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- YES EQU 0FFH
- NO EQU 0
- ;
- ;====================== CUSTOMIZATION EQUATES ==========================
- ;
- ; Only APPLIED OR MICROSOFT CP/M adapter cards
- ;
- MICROSOFT EQU YES ; Yes if Microsoft Softcard CP/M card
- ALS EQU NO ; Yes if ALS Z-Engine
- APPLIED EQU NO ; Yes if using Applied Engineering Z80
- ;
- ;-----------------------------------------------------------------------
- ;
- ; All addresses are 6502 memory map (Z80 map is offset on Softcard)
- ;
- SLOT1 EQU NO ; Yes for slot 1
- SLOT2 EQU YES ; Yes for slot 2
- ;
- IF SLOT1
- MDCMD EQU 0C039H ; Address of command port A
- ENDIF
- ;
- IF SLOT2
- MDCMD EQU 0C038H ; Address of command port B
- ENDIF
- ;
- MDDATP EQU MDCMD+2 ; Address of data port
- MOFFSET EQU 1000H ; Memory offset of Microsoft card
- SOFFSET EQU 2000H ; Slotspace offset of Microsoft card
- MSCARD EQU 03DEH-MOFFSET ; Softcard address
- ADDRS EQU 03D0H-MOFFSET ; Address for 6502 to execute
- MDRXF EQU 01H ; Receive register full bit
- MDTXE EQU 04H ; Transmit register empty bit
- MDSND EQU 04H ; Same as TXE
- ;
- ;-----------------------------------------------------------------------
- ;
- ; General equates
- ;
- 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 now
- CR EQU 'M'-40H ; ^M = Carriage return
- CLEARSC EQU 'Z'-40H ; ^Z = Clear 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 6 ; 0=110 1=300 2=450 3=600 4=710 5=1200 103H
- ; 6=2400 7=4800 8=9600 9=19200 default
- ;
- HS2400: DB YES ; Yes=2400 bps highest speed 104H
- HS1200: DB NO ; Yes=1200 bps highest speed 105H
- RACAL: DB NO ; Yes=Racal-Vadic 1200V or 2400V or 2400PA 106H
- PROMODM: DB NO ; Yes=Prometheus ProModem 1200 bps 107H
- RESVD1: DB NO ; Reserved for special modems 108H
- RESVD2: DB NO ; Reserved for special modems 109H
- ;
- CLEAR: DB 26 ; Clear screen character (ESC not needed) 10AH
- CLOCK: DB 20 ; Clock speed in MHz x10, 25.5 MHz max. 10BH
- ; 20=2 MHh, 37=3.68 MHz, 40=4 MHz, etc.
- BYTDLY: DB 0 ; 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 5 ; 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$MDRXF: LDA MDCMD+SOFFSET ; Test for receive reg full 11FH
- RET ; Jumps removed for speed
- DB 0,0,0,0,0,0 ; Spares if needed 123H
- ;
- I$MDTXE: LDA MDCMD+SOFFSET ; Test for transmit reg empty 129H
- RET
- DB 0,0,0,0,0,0 ; 12DH
- ;
- I$MDDATP: LDA MDDATP+SOFFSET ; In modem data port 133H
- RET
- DB 0,0,0,0,0,0 ; 147H
- ;
- O$MDDATP: JMP SNDDATP ; Out modem data port 13DH
- DB 0,0,0,0,0,0,0 ; 140H
- ;
- A$MDRXF: ANI MDRXF ; 147H
- RET ; 149H
- ;
- C$MDRXF: CPI MDRXF ; 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 NO ; YES if manual stepdown 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 'Apple IIGS and '
- ;
- IF MICROSOFT
- DB 'Microsoft Z80 Softcard'
- ENDIF ; MICROSOFT
- ;
- IF ALS
- DB 'ALS Z-Engine'
- ENDIF ; ALS
- ;
- IF APPLIED
- DB 'Applied Engineering Z80+ Card'
- ENDIF ; APPLIED
- ;
- 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 'Basselopes eat Poptarts (with butter!)',CR,0
- ;
- ;======================== BREAK/GOODBYE ===============================
- ;
- SENDBRK:MVI A,01111010B ; DTR on, BRK on
- JMP GOBRK
- ;
- GOODBYE:MVI A,11111010B ; DTR off, BRK on
- GOBRK: MVI B,5
- CALL SETCMD ; Set register 5
- MVI B,3
- CALL J$TIMER
- MVI A,01101010B ; DTR on, BRK off
- MVI B,5
- JMP SETCMD ; Set register 5
- ;
- ;=========================== INITMOD ===================================
- ;
- INITMOD:PUSH H
- LXI H,BITS ; Get table address
- LOOP: MOV A,M ; Get reg number
- ORA A
- JZ DONE ; Zero is end
- MOV B,A ; Put reg number in B
- INX H
- MOV A,M ; Get reg value
- INX H
- CALL SETCMD ; And set it
- JMP LOOP
- DONE: POP H
- LDA MSPEED ; Autoset baudrate
- CPI 1
- JZ OK300
- CPI 5
- JZ OK1200
- CPI 6
- JZ OK2400
- CPI 7
- JZ OK4800
- CPI 8
- JZ OK9600
- JMP STUPR1 ; Bad value in overlay, ask
- ;
- BITS: IF SLOT1
- DB 09,10000000B ; Reset channel A
- ENDIF
- IF SLOT2
- DB 09,01000000B ; Reset channel B
- ENDIF
- DB 11,11010000B ; Set xtal on RTxC and Rx-Tx to BR gen
- DB 12,2EH ; Low byte of BR generator
- DB 13,00H ; High byte of baud
- DB 14,00000001B ; Enable BR generator
- DB 15,00000000B ; Kill interrupts
- DB 01,00000000B ; Kill Rx-Tx interrupts
- DB 03,11000001B ; Rx-8bit, Rx on
- DB 04,01000100B ; X16 clock, 1 stop, no parity
- DB 05,01101010B ; Tx-8bit, Tx on, DTR on, BRK off
- DB 0
- ;
- ;========================== APPLE I/O ==================================
- ;
- ; Explanation of using the 6502 to write to SCC registers:
- ; Due to the differences in 6502/Z80 buss structure, all writes to the
- ; SCC must be done by the 6502. Z80 CPU and peripherals use a two line
- ; read/write, where the 65 series use a single R/W line. When a
- ; conversion is made to/from a Z80 chip, the separate R/W lines are
- ; combined. The problem comes when the Z80 CPU signals a null buss cycle
- ; (No read and no write.) Since there is no equivilant condition on the
- ; Apple buss, this null condition is considered a read.
- ; Here is where the SCC gets confused. When registers are changed,
- ; the register number is written to the command register followed by the
- ; new register value. The Z80 CPU (on the Apple buss) writes to the
- ; register fine, but then asserts a null buss cycle durring processing.
- ; The address from the previous write is still on the address buss and
- ; the null buss state is converted to a read. This false read resets the
- ; commad register of the SCC to zero, invalidating the current register
- ; number. The following data is then written to register zero.
- ;
- SNDDATP:STA BUFF ; Save register value
- PUSH H
- LXI H,SND65+MOFFSET ; Get 6502 routine address
- GO6502: SHLD ADDRS ; Save it
- LHLD MSCARD ; Get Softcard address
- MOV M,A ; And switch to 6502
- POP H ; We're back, restore HL
- RET
- ;
- SND65: DB 0ADH
- DW BUFF+MOFFSET ; LDA BUFF
- DB 08DH
- DW MDDATP ; STA MDDATP
- DB 060H ; RTS
- ;
- SETCMD: STA BUFF ; Save register value
- MOV A,B
- STA REG ; Save register number
- PUSH H
- LXI H,SET65+MOFFSET
- JMP GO6502
- ;
- SET65: DB 0ADH
- DW REG+MOFFSET ; LDA REG
- DB 08DH
- DW MDCMD ; STA MDCMD
- DB 0ADH
- DW BUFF+MOFFSET ; LDA BUFF
- DB 08DH
- DW MDCMD ; STA MDCMD
- DB 060H ; RTS
- ;
- BUFF: DB 0
- REG: DB 0
- ;
- ;============================ STUPR ====================================
- ;
- ; Use the 'SET' command to select a desired baud rate
- ;
- STUPR: CALL J$CMDSPL ; Gives us CMDBUF+6
- JNC STUPR2
- ;
- STUPR1: CALL J$ILPRT
- DB 'Input Baud Rate (300, 1200, 2400, 4800, 9600): ',0
- LXI D,BAUDBUF ; Point to new input buffer
- CALL J$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$INLNCP
- DB '4800',0
- JNC OK4800
- CALL J$INLNCP
- DB '9600',0
- JNC OK9600
- CALL J$ILPRT ; All matches failed, tell operator
- DB '++ Incorrect entry ++',CR,LF,BELL,CR,LF,0
- JMP STUPR1 ; Try again
- ;
- OK300: MVI A,1
- MVI B,7EH ; Baud value for 300 is actually 17EH
- JMP LOADBD ; Taken care of in LOADBD
- ;
- OK1200: MVI A,5
- MVI B,5EH ; Baud rate values same as Apple's
- JMP LOADBD
- ;
- OK2400: MVI A,6
- MVI B,2EH
- JMP LOADBD
- ;
- OK4800: MVI A,7
- MVI B,16H
- JMP LOADBD
- ;
- OK9600: MVI A,8
- MVI B,0AH
- ;
- LOADBD: STA MSPEED ; Save baud rate
- MOV A,B ; Move timer value into A
- MVI B,12
- CALL SETCMD ; Set reg 12
- LDA MSPEED ; Get baud back
- CPI 1 ; Is it 300?
- JZ ONE
- XRA A ; Zero for all bauds but 300
- ONE: MVI B,13
- JMP SETCMD ; Set reg 13
- ;
- BAUDBUF:DB 10,0,0,0,0,0
- DB 0,0,0,0,0,0
- ;
- ;-----------------------------------------------------------------------
- ;
- ; Pinout and cabling for GS serial port
- ; _________
- ; / \ / \ Apple IIgs Serial port as seen from rear of
- ; / (8) (7) (6) \ computer. Note: these ports are RS422, to
- ; / \ make them compatible with RS232 devices
- ; < (5) (4) (3) > pin 8 must connect to pin 4 (ground.)
- ; \_ _/ This converts RS422 to RS423, the same
- ; \| (2) (1) |/ as RS232 except for voltage (+-5 versus +-12.)
- ; \ _________ /
- ;
- ; Pin 1 - Output handshake (DTR) Set with reg 5, mask=80H (inverted)
- ; Pin 2 - Input handshake (DCD, DSR or RING) Test with mask=20H
- ; Pin 3 - Transmit data- Connect to modem receive
- ; Pin 4 - Ground
- ; Pin 5 - Receive data- Connect to modem transmit
- ; Pin 6 - Transmit data+ Leave unconnected
- ; Pin 7 - Not connected
- ; Pin 8 - Receive data+ Must be connected to ground
- ;
- ;-----------------------------------------------------------------------
- ;
- ; Overlay must terminate before 400H