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-
- ; I2OS-4.ASM - Osborne OS-1 overlay file for IMP2 - 06/01/87
- ;
- ; 6850 ACIA
- ; NOTE:
- ;
- ; This overlay will NOT work with the Osborne COMM-PAC modem or
- ; CTS DATACOMM modem. Both of these modems fit in the Osborne 1
- ; left diskette storage pocket and connect to the 9 pin modem
- ; socket. These two modems are 300 bps only and do not have the
- ; faster baud rates necessary to take advantage of the IMP2 pro-
- ; gram.
- ;
- ; The new 1K CRC protocol is not supported at 300 bps in IMP or
- ; KMD. KMD batch transfers with IMP and KMD are supported only
- ; with 1K CRC protocol at 1200 and 2400 bps.
- ;
- ; No real advantage is gained with using IMP at 300 bps. Osborne
- ; COMM-PAC and CTS DATACOM users should continue to use MDM740.
- ;
- ;-----------------------------------------------------------------------
- ;
- ; 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 IMP2
- ; 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=IMP2xx.COM,I2OS-x.HEX
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ; 06/01/87 Improved the GOODBYE routine, added BREAK routine, needs
- ; IMP245 to use it. - Irv Hoff
- ; 05/27/86 * Re-edited NUEVO routines to correct assembly errors.
- ; * Re-edited documentation on hardware modifications.
- ; * Software selection for 2400 bps operation now available
- ; with Osborne ROM version 1.45.
- ; - Roy Robinson
- ; FOG #4 RCP/M
- ;
- ; 10/27/85 * Modified for DTR control of modem.
- ; * Added NUEVO equate to provide software selection for 2400
- ; bps. - Roy Robinson
- ;
- ; 06/27/85 Written for use with IMP2 - Irv Hoff
- ;
- ;
- ; = = = = = = = = = = = = = = = = =
- ;
- ; DOCUMENTATION FOR THIS IMP OVERLAY:
- ;
- ; SUMMARY:
- ;
- ; If you intend to use this overlay with none of the hardware modifica-
- ; tions described below, set the ROM145 and DTRMOD equates to NO. Your
- ; version of IMP2 will have the following baud rate selections: 300 and
- ; 1200 bps.
- ;
- ; The NUEVO equate allows the use of a separate "piggy-back" 80 column
- ; video board with the optional baud rate generator installed. This
- ; board is made by NUEVO Electronics Corporation. You may contact NUEVO
- ; Electronics at the VOICE phone number (713) 341-6001.
- ;
- ; The DTRMOD equate allows hardware control of the external modem. The
- ; DTR signal line can force the modem to hangup the telephone line.
- ;
- ; The ROM145 equate allows the use of a special ROM for supporting soft-
- ; ware selection of 300/1200/2400 bps with IMP2.
- ;
- ; ------------
- ; The NUEVO equate:
- ;
- ; If you have the NUEVO 80 column video board with the optional baud
- ; rate generator installed, set the NUEVO equate to YES. You will have
- ; the following baud rate selections: 300, 1200, 2400, 4800, 9600 and
- ; 19200 bps. Setting either the HS2400 or HS1200 equate to YES, along
- ; with the matching MSPEED value will configure IMP for 2400 or 1200
- ; bps respectively when the program is called up.
- ;
- ; If your NUEVO 80 column board does NOT have the optional baud rate
- ; generator, set the NEUVO equate to NO. You will have the following
- ; baud rate selections: 300 and 1200 bps.
- ; Contact NUEVO if you wish to install the baud rate generator on your
- ; NUEVO 80 column board.
- ;
- ; Be sure the ROM145 equate is set to NO if the NUEVO equate is set YES.
- ;
- ;
- ; ------------
- ; The DTRMOD equate:
- ;
- ; If you install the DTR modification on your Osborne 1 main logic board
- ; set the DTRMOD equate to YES. If you are using an UNMODIFIED main
- ; logic board, set the DTRMOD equate to NO. The DTR modification gives
- ; the Osborne 1 the feature of forcing the modem to hang up the phone by
- ; dropping the 6850 ACIA RTS line. This control line is then connected
- ; to the modem DTR input.
- ;
- ; The DTR modification is highly recommended if your modem does not
- ; accept the Hayes/Racal-Vadic modem software command format.
- ;
- ; If you do use the DTR modification, you will need to build a special
- ; RS-232 cable from your Osborne 1 serial port to your external modem.
- ; Your modem must support DTR line control and you must set the proper
- ; modem switch(es) or program the modem internal memory to monitor the
- ; DTR signal.
- ;
- ; Below is the RS-232 cable diagram for an external modem using DTR
- ; control and the Osborne OS-1:
- ;
- ;
- ; MODEM OCC-1
- ;
- ; 2 TXD 3 TXD
- ; 3 RXD 2 RXD
- ; 7 GND 7 GND
- ; 20 DTR 5 RTS (new function)
- ;
- ;
- ;
- ; INSTALLATION OF THE DTR MODIFICATION
- ;
- ; The main logic board is divided into zones which are identified on the
- ; component side of the board by LETTER co-ordinates found on the left
- ; edge of the board and by NUMBER co-ordinates found on the rear edge of
- ; the board i.e., the 6850 ACIA device is located in zone C5 and the
- ; MC1458 device is located in zone E3. The NUMBER co-ordinates are also
- ; found near the center axis along the length of the main logic board.
- ; The front edge of the logic board has the printer connector, serial
- ; connector, and video controls mounted at this edge.
- ;
- ;
- ; A WORD OF CAUTION:
- ; If you are unsure how to identify IC devices and count device pin num-
- ; bers, find a friend who does, attend a user group meeting, or take
- ; your computer to a computer store/service center for further help.
- ; This advice ALSO applies if you do not have experience in good solder-
- ; ing techniques. I have seen these expensive boards burned with traces
- ; and pads damaged by people using improper soldering irons. These
- ; boards have been ruined by users using acid core solder instead of
- ; good quality electronic solder. I have seen boards damaged by solder
- ; bridges and poorly laid out component installation. Please, if you
- ; don't know what you are doing, find someone who does. You may contact
- ; FOG, an international user group, if you have any questions about
- ; these modifications. You may contact FOG by calling the VOICE number:
- ; (415) 755-2000 or by writing to:
- ;
- ; FOG
- ; P. O. BOX 3474,
- ; Daly City, CA 94015-0474
- ;
- ;
- ;
- ; OSBORNE 1 MAIN LOGIC BOARD TRACE CUTS:
- ;
- ; On the main logic board - SOLDER SIDE:
- ;
- ; 1. Cut the trace running from pin 5 to pin 6 on the inner row of
- ; pads used to mount the RS-232 female serial connector at the
- ; front edge of the main logic board. Pins 5 and 6 are the only
- ; ADJACENT pins with a trace connecting them. Do not confuse this
- ; trace with another trace which connects pins 6 and 8. Pin 1 is
- ; the pad with a wide ground trace.
- ;
- ; On the main logic board - COMPONENT SIDE:
- ;
- ; 2. Cut the trace from pin 5 of the 6850 ACIA device in zone C5 to
- ; resistor R20 (10K ohm) in zone D5.
- ;
- ; PART ADDITIONS:
- ;
- ; On the main logic board SOLDER SIDE:
- ;
- ; 3. Add a jumper wire from pin 1 of the MC1458 device in zone E3 to
- ; pin 5 on the inner row of RS-232 serial port pads. Pin 1 of the
- ; serial port is the pad with a wide ground trace.
- ;
- ; 4. Add a jumper wire from pin 3 of the MC1458 device in zone E3 to
- ; pin 5 of the same MC1458 device in zone E3.
- ;
- ; On the main logic board COMPONENT SIDE or SOLDER SIDE:
- ;
- ; (whichever side you feel is easier for mounting
- ; two 1/4 watt resistors)
- ;
- ; 5. Mount a 10K ohm resistor from Vcc which is +5 volts (pin 14 of
- ; the 74LS02 device in zone D2 is a good solder point) to pin 2 of
- ; the MC1458 device in zone E3.
- ;
- ; 6. Mount a 220 ohm resistor from pin 5 of the 6850 ACIA device in
- ; zone C5 to pin 2 of the MC1458 device in zone E3. Pin 2 of the
- ; MC1458 device in zone E3 should now have two resistor leads
- ; soldered to it.
- ;
- ;
- ; ------------
- ; The ROM145 equate:
- ;
- ; This equate uses a new Osborne 1 Monitor ROM, Version 1.45. This ROM
- ; allows 300/1200/2400 baud software selection for the 6850 ACIA. The
- ; ROM is used with a hardware modification to the Osborne 1 main logic
- ; board. The hardware modification involves installation of five jumper
- ; wires.
- ;
- ; The code in the new 1.45 ROM changes the 6821 control byte value for
- ; the video PIA register A. The CA2 Peripheral Control Line now becomes
- ; an output control line rather than an input status line.
- ;
- ; If the modification is installed you will be unable to use the Osborne
- ; COMM-PAC or CTS DATA-COMM modems. The CA2 line was originally a modem
- ; input status line for these modems. With the new ROM, the CA2 line is
- ; now an output control line used for selecting one of two clock fre-
- ; quencies input to the 6850 ACIA.
- ;
- ; If you have a single density Osborne 1 computer (ROM versions 1.3 and
- ; lower). You cannot install this modification. Contact FOG for fur-
- ; ther help.
- ;
- ; The new ROM 1.45 is available from FOG, a non-profit international
- ; computer user group.
- ;
- ; You may contact FOG by calling the VOICE number (415) 755-2000 or by
- ; writing to:
- ;
- ; FOG
- ; P. O. BOX 3474,
- ; Daly City, CA 94015-0474
- ;
- ;
- ; INSTALLATION OF ROM 1.45 MODIFICATION:
- ;
- ; On the main logic board - COMPONENT SIDE:
- ;
- ; 1. Replace the old ROM with the new ROM version 1.45. This ROM is
- ; found at location D12. Note the orientation of pin 1 for the
- ; ROM.
- ;
- ; 2. Remove Jumper J1 located next to the 6850 ACIA device located
- ; in zone C5. There is a silkscreen notation "J1" adjacent to the
- ; jumper. This will expose two pins which we will refer to as the
- ; Jumper J1 FRONT pin and the Jumper J1 REAR pin.
- ;
- ; Jumper J1 FRONT pin is the pin toward the front edge of the main
- ; logic board. The front edge has the printer connectors and video
- ; controls mounted at the edge. Since we will be mounting jumpers
- ; on the solder side of the main logic board, you will be able to
- ; identify the Jumper J1 FRONT pin because this pin has a trace
- ; leading to pin 7 of the 74LS161 device at zone C3 on the solder
- ; side of the main logic board.
- ; Jumper J1 REAR pin has no trace on the solder side of the board
- ; and is located toward the rear edge of the main logic board.
- ;
- ; On the main logic board - SOLDER SIDE
- ;
- ; 3. Mount a jumper wire from pin 4 of the 74LS08 device in zone A5
- ; to the REAR pin of Jumper J1. This REAR J1 pin is the pin which
- ; is closer to the 74LS08 device.
- ;
- ; 4. Mount a jumper wire from pin 5 of the 74LS08 device in zone A5
- ; to pin 39 of the 6821 device found within zones C15, C16, C17,
- ; and C18. (The 6821 is a 40 pin device and occupies several
- ; zones.)
- ;
- ; 5. Mount a jumper wire from pin 6 of the 74LS08 device in zone A5
- ; to pin 5 of the 74LS02 device in zone D2.
- ;
- ; 6. Mount a jumper wire from pin 5 of the 74LS02 device in zone D2
- ; to pin 6 of the same 74LS02 device in zone D2. Pin 5 of the
- ; 74LS02 device in zone D2 now has two jumpers soldered to it.
- ;
- ; 7. Mount a jumper wire from pin 4 of the 74LS02 device in zone D2
- ; to the FRONT pin of Jumper J1. This FRONT J1 pin is the pin
- ; which is closer to the 74LS02 device.
- ;
- ;-----------------------------------------------------------------------
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ;* TAMPERING WITH YOUR MAIN LOGIC BOARD MAY VOID ANY WARRANTY
- ; OR SERVICE AGREEMENTS ON YOUR COMPUTER.
- ;
- ;* UNPLUG YOUR COMPUTER FROM THE AC OUTLET BEFORE DISASSEMBLING
- ; THE COMPUTER. USE COMMON SENSE.
- ;
- ;* ALTHOUGH THE MODIFICATION HAS BEEN TESTED ON SEVERAL MAIN
- ; LOGIC BOARDS HAVING DIFFERENT REVISION LEVELS, THE MODIFI-
- ; CATION IS DONE AT YOUR OWN RISK.
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ;
- YES EQU 0FFH
- NO EQU 0
- ;
- ;
- ; EQUATES FOR MODIFICATIONS TO STANDARD OZZIE MAIN LOGIC BOARD
- ;
- DTRMOD EQU NO ; YES, if hardware mods have been installed on
- ; Osborne 1 main logic board to support DTR
- ; control of external modem.
- ; NO, if you have an UNMODIFIED main logic
- ; board
- ; (see discussion above)
- ;
- NUEVO EQU NO ; YES, if Nuevo 80 column upgrade WITH Baud Rate
- ; Generator option has been installed
- ; NO, if you do not have a Nuevo 80 column up-
- ; grade or if your Nuevo 80 column upgrade
- ; DOES NOT have the Baud Rate Generator op-
- ; tion installed. (See discussion above.)
- ;
- ROM145 EQU NO ; YES, if hardware mods have been installed on
- ; Osborne 1 main logic board to support 2400
- ; bps WITH ROM version 1.45.
- ; NO, if the ROM monitor is NOT Version 1.45
- ; (see discussion above)
- ;
- ;
- ; Values shown are for the 6850 ACIA serial I/O device
- ;
- PORT EQU 2A00H ; OCC-1 base address
- ; (memory mapped for data and status)
- MDCTL1 EQU PORT ; Modem control address (memory mapped i/o)
- MDDATP EQU PORT+1 ; Modem data address (memory mapped i/o)
- MDRCV EQU 01H ; Modem receive data register full (RDRF)
- MDSND EQU 02H ; Modem transmit data register empty (TDRE)
- MDTXE EQU 02H ; Modem transmit buffer empty (set to MDSND)
- RMDRCV EQU 0FEH ; Used with SSTAT routines
- RMDSND EQU 0FDH ; Used with SSTAT routines
- ;
- ;
- ; NOTE: The 6850 ACIA, "an early generation serial I/O chip", has
- ; only one output status bit with the mask value: 02h.
- ; This output status bit is defined as "Transmit Data Register
- ; Empty" and is roughly equivalent to the "Transmit Buffer
- ; Empty" status bit found in modern I/O chips. Most modern
- ; I/O chips have an additional output status bit which is a
- ; "Transmit Ready" status bit. The 6850 ACIA does not have
- ; this status bit. Without this second status bit available,
- ; the timing routines for the ASCII upload function in IMP2
- ; which involve inter-character timing delay and end-of-line
- ; timing delay do not work as efficiently.
- ; For the Osborne 1 you will not have as effective a range of
- ; timing delay values as on computers using more advanced I/O
- ; chips . You will have enough delay timing for most ASCII
- ; upload applications.
- ;
- ;-----------------------------------------------------------------------
- ;
- 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 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 1AH ; Clear screen character (ESC not needed) 10AH
- CLOCK: DB 40 ; Clock speed in MHz x10, 25.5 MHz max. 10BH
- ; 20=2 MHh, 37=3.68 MHz, 40=4 MHz, etc.
- BYTDLY: DB 4 ; 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 4 ; 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 4 ; 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$MDCTL1: JMP OSTAT ; 11FH
- DB 0,0,0,0,0,0,0 ; Spares if needed 122H
- ;
- I$MDTXE: JMP OSTAT ; 129H
- DB 0,0,0,0,0,0,0 ; Spares if needed 12CH
- ;
- I$MDDATP: JMP OSIN ; 133H
- DB 0,0,0,0,0,0,0 ; Spares if needed 136H
- ;
- O$MDDATP: JMP OSOUT ; 13DH
- DB 0,0,0,0,0,0,0 ; Spares if needed 140H
- ;.....
- ;
- ;
- 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$EXITVEC:
- JMP RSTINT ; 159H
- ;.....
- ;
- ;
- ; Jump vectors needed by each overlay
- ;
- J$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 Osborne 1' ; 1AAH
- ;
- IF NUEVO
- DB ' with Neuvo BRG option'
- ENDIF ; NUEVO
- ;
- IF DTRMOD
- DB ' and DTR mod',CR,LF
- ENDIF ; DTRMOD
- ;
- IF NOT DTRMOD
- DB ' without DTR mod',CR,LF
- ENDIF ; NOT DTRMOD
- ;
- 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 'Greetings from an Osborne 1 user',CR,LF,0
- ;
- ;-----------------------------------------------------------------------
- ;
- ; This routine sends a 300 ms break tone
- ;
- SENDBRK:
- IF NOT DTRMOD
- RET
- ENDIF ; NOT DTRMOD
- ;
- IF DTRMOD ; Stop any incoming characters
- MVI C,77H ; Send break, RTS active,
- CALL STBAUD ; Send to status port routine
- MVI B,3 ; Delay 300 ms. fora break tone
- CALL J$TIMER
- JMP GOODBYE1
- ENDIF ; DTRMOD
- ;.....
- ;
- ;
- ; This routine sets the ACIA RTS output low for 300 ms. to disconnect
- ; the phone. The RTS output from 6850 is connected to the DTR input of
- ; the modem.
- ; This routine drops DTR for 300 ms to disconnect the phone.
- ;
- GOODBYE:
- IF NOT DTRMOD
- RET
- ENDIF ; NOT DTRMOD
- ;
- IF DTRMOD
- MVI C,77H ; Send break, RTS active,
- CALL STBAUD ; Send to status port routine
- MVI B,3 ; Delay 300 ms. to hang up the phone
- CALL J$TIMER
- MVI C,57H ; Disable break and RTS to hang-up modem
- CALL STBAUD ; Send to status port routine
- MVI B,10 ; Delay 1 second to hang up phone
- CALL J$TIMER
- ;
- GOODBYE1:
- LDA BAUDRTE ; RTS active, same baud rate
- MOV C,A
- JMP STBAUD ; Send to status port routine
- RET
- ENDIF ; DTRMOD
- ;.....
- ;
- ;
- ; You can use this area for any special initialization or setup you may
- ; wish to include. Each must stop with a RET. You can check the other
- ; available overlays for ideas how to write your own routines if that
- ; may be of some help.
- ;
- ;
- IF ROM145 AND NOT NUEVO
- B$SET: JMP BRATE ; Jump to relocated routine which se-
- ; lects high/low clock rate for ACIA
- ; TXD/RXD clock inputs.
- ENDIF ; ROM145 AND NOT NUEVO
- ;
- ;.....
- ;
- ;
- INITMOD:
- LHLD 0005H+1 ; Find start of bdos
- LXI D,-0100H ; Go to first page ahead of bdos
- DAD D ; HL now positioned one page below bdos
- PUSH H ; Save the address
- LXI D,BDJ ; Point to our routine to put there
- LXI B,CDLEN+2 ; Set length of code
- XCHG
- DB 0EDH,0B0H ; Z80 LDIR instruction
- ;
- LHLD 0005H+1 ; Get BDOSs address back once more
- POP D ; Get starting address off the stack
- PUSH D ; Put it back on the stack
- INX D ; Point to address position
- XCHG ; Put into HL register pair
- MOV M,E ; Store 'LSP' address
- INX H ; Get 'LSP' location
- MOV M,D ; Store 'MSP' address
- POP H ; Get the address back once more
- SHLD 0005H+1 ; New address to protect from overwrite
- ;
- LXI D,OSIN-BDJ ; Get OSICN length for relocation
- DAD D ; Commute address of the OSIN routine
- SHLD I$MDDATP+1 ; Patch call for "GET CHARACTER" routine
- ;
- LXI D,OSOUT-OSIN ; Get OSOUT length for relocation
- DAD D ; Commute address of the OSOUT routine
- SHLD O$MDDATP+1 ; Patch call for "SEND CHARACTER" routine
- ;
- LXI D,OSTAT-OSOUT ; Get OSTAT length for relocation
- DAD D ; Commute address of OSTAT routine
- SHLD I$MDCTL1+1 ; Patch call for "GET I/O STATUS" routine
- SHLD I$MDTXE+1 ; Patch call for "TRANSMIT BUFFER EMPTY"
- ; routine
- ;
- IF ROM145 AND NOT NUEVO
- LXI D,BRATE-OSTAT ; Get BRATE length for relocation
- DAD D ; Commute address of BRATE routine
- SHLD B$SET+1 ; Patch call for "RX/TX CLOCK SELECT" routine
- ENDIF ; ROM145 AND NOT NUEVO
- ;
- ;
- ; Set-up program default baud rate, then finish with initialization
- ;
- LDA MSPEED ; Get program default baud rate value
- CPI 1 ; 300 bps
- JZ OK300
- CPI 5 ; 1200 bps
- JZ OK1200
- ;
- IF NUEVO OR ROM145
- CPI 6 ; 2400 bps
- JZ OK2400
- ENDIF ; NUEVO OR ROM145
- ;
- JMP STUPR1 ; Else ask what is wanted
- ;
- ;.....
- ;
- ;
- ;-----------------------------------------------------------------------
- ;
- RSTINT:
- JMP 0000H ; Osborne 1 likes this jump upon exit
- ;
- ;.....
- ;
- ;
- ;-----------------------------------------------------------------------
- ;
- STUPR: CALL J$CMDSPL ; Gives us CMDBUF+6
- JNC STUPR2
- ;
- STUPR1: CALL J$ILPRT
- ;
- IF NOT NUEVO AND NOT ROM145
- DB 'Input Baud Rate (300, 1200): ',0
- ENDIF ; NOT NUEVO AND NOT ROM145
- ;
- IF NUEVO AND NOT ROM145
- DB 'Input Baud Rate (300, 1200, 2400, 4800, 9600, 19200): ',0
- ENDIF ; NUEVO AND NOT ROM145
- ;
- IF ROM145 AND NOT NUEVO
- DB 'Input Baud Rate (300, 1200, 2400): ',0
- ENDIF ; ROM145 AND NOT NUEVO
- ;
- LXI D,BAUDBUF ; Point to new input buffer
- CALL J$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$INLNCP
- DB '1200',0
- JNC OK1200
- ;
- IF NUEVO OR ROM145
- CALL J$INLNCP
- DB '2400',0
- JNC OK2400
- ENDIF ; NUEVO OR ROM145
- ;
- IF NUEVO AND NOT ROM145
- CALL J$INLNCP
- DB '4800',0
- JNC OK4800
- CALL J$INLNCP
- DB '9600',0
- JNC OK9600
- CALL J$INLNCP
- DB '19200',0
- JNC OK19200
- ENDIF ; NUEVO AND NOT ROM145
- ;
- CALL J$ILPRT ; All matches failed, tell operator
- DB '++ Incorrect entry ++',CR,LF,BELL,CR,LF,0
- JMP STUPR1 ; Try again
- ;
- ;.....
- ;
- ;
- IF (NOT NUEVO AND NOT ROM145)
- OK300: MVI A,1 ; MSPEED 300 baud value
- ENDIF ; (NOT NUEVO AND NOT ROM145)
- ;
- IF (NOT NUEVO AND NOT ROM145) AND DTRMOD
- MVI C,16H ; X64 clock, 8 DB 1 SB, RTS active
- ENDIF ; (NOT NUEVO AND NOT ROM145) AND DTRMOD
- ;
- IF (NOT NUEVO AND NOT ROM145) AND NOT DTRMOD
- MVI C,56H ; X64 clock, 8 DB 1 SB, RTS inactive
- ENDIF ; NOT NUEVO AND NOT ROM145 AND NOT DTRMOD
- ;
- IF (NOT NUEVO AND NOT ROM145)
- JMP LOADBD ; Load ACIA control byte
- ;
- OK1200: MVI A,5 ; MSPEED 1200 baud value
- ENDIF ; (NOT NUEVO AND NOT ROM145)
- ;
- IF (NOT NUEVO AND NOT ROM145) AND DTRMOD
- MVI C,15H ; X16 clock, 8 DB 1 SB, RTS active
- ENDIF ; (NOT NUEVO AND NOT ROM145) AND DTRMOD
- ;
- IF (NOT NUEVO AND NOT ROM145) AND NOT DTRMOD
- MVI C,55H ; X16 clock, 8 DB 1 SB, RTS inactive
- ENDIF ; (NOT NUEVO AND NOT ROM145) AND NOT DTRMOD
- ;
- IF (NOT NUEVO AND NOT ROM145)
- OK2400: ; Needs to be here even if not supported
- ;
- LOADBD: STA MSPEED
- MOV A,C ; Move ACIA control byte from C to A
- STA BAUDRTE ; Save ACIA control byte
- ENDIF ; (NOT NUEVO AND NOT ROM145)
- ;
- ;....
- ;
- ;
- IF (ROM145 AND NOT NUEVO)
- OK300: MVI A,1 ; MSPEED 300 baud value
- ENDIF ; (ROM145 AND NOT NUEVO)
- ;
- IF (ROM145 AND NOT NUEVO) AND DTRMOD
- MVI C,16H ; X64 clock, 8 DB 1 SB, RTS active
- ENDIF ; (ROM145 AND NOT NUEVO) AND DTRMOD
- ;
- IF (ROM145 AND NOT NUEVO) AND NOT DTRMOD
- MVI C,56H ; X64 clock, 8 DB 1 SB, RTS inactive
- ENDIF ; (ROM145 AND NOT NUEVO) AND NOT DTRMOD
- ;
- IF (ROM145 AND NOT NUEVO)
- MVI B,3FH ; Get low baud parameter
- JMP LOADBD ; Load ACIA control byte
- ;
- OK1200: MVI A,5 ; MSPEED 1200 baud value
- ENDIF ; (ROM145 AND NOT NUEVO)
- ;
- IF (ROM145 AND NOT NUEVO) AND DTRMOD
- MVI C,15H ; X16 clock, 8 DB 1 SB, RTS active
- ENDIF ; (ROM145 AND NOT NUEVO) AND DTRMOD
- ;
- IF (ROM145 AND NOT NUEVO) AND NOT DTRMOD
- MVI C,55H ; X16 clock, 8 DB 1 SB, RTS inactive
- ENDIF ; (ROM145 AND NOT NUEVO) AND NOT DTRMOD
- ;
- IF (ROM145 AND NOT NUEVO)
- MVI B,3FH ; Get low baud parameter
- JMP LOADBD ; Load ACIA control byte
- ;
- OK2400: XRA A ;
- STA MANUAL ; Reset to maximum auto-speed for
- MVI A,6 ; 2400 bps auto-step down modems
- ENDIF ; (ROM145 AND NOT NUEVO)
- ;
- IF (ROM145 AND NOT NUEVO) AND DTRMOD
- MVI C,15H ; X16 clock, 8 DB 1 SB, RTS active
- ENDIF ; (ROM145 AND NOT NUEVO) AND DTRMOD
- ;
- IF (ROM145 AND NOT NUEVO) AND NOT DTRMOD
- MVI C,55H ; X16 clock, 8 DB 1 SB, RTS inactive
- ENDIF ; (ROM145 AND NOT NUEVO) AND NOT DTRMOD
- ;
- IF (ROM145 AND NOT NUEVO)
- MVI B,37H ; Get high baud parameter
- ;
- LOADBD: STA MSPEED
- MOV A,C
- STA BAUDRTE
- CALL B$SET ; Select high/low baud rate status bit
- ENDIF ; (ROM145 AND NOT NUEVO)
- ;
- ;..
- ;
- ;
- IF (NUEVO AND NOT ROM145)
- OK300: MVI A,1 ; MSPEED 300 baud value
- MVI B,05H ; Get 300 bps byte
- JMP LOADBD ; Load baud rate generator control byte
- ;
- OK1200: MVI A,5 ; MSPEED 1200 baud value
- MVI B,07H ; Get 1200 bps byte
- JMP LOADBD ; Load baud rate generator control byte
- ;
- OK2400: XRA A ; Reset to maximum auto-speed for
- STA MANUAL ; 2400 bps auto-step down modems
- MVI A,6 ; MSPEED 2400 baud value
- MVI B,0AH ; Get 2400 bps byte
- JMP LOADBD ; Load baud rate generator control byte
- ;
- OK4800: MVI A,7 ; MSPEED 4800 baud value
- MVI B,0CH ; Get 4800 bps byte
- JMP LOADBD ; Load baud rate generator control byte
- ;
- OK9600: MVI A,8 ; MSPEED 9600 baud value
- MVI B,0EH ; Get 9600 bps byte
- JMP LOADBD ; Load baud rate generator control byte
- ;
- OK19200:
- MVI A,9 ; MSPEED 19200 baud value
- MVI B,0FH ; Get 19200 bps byte
- ;
- LOADBD: STA MSPEED ; Save MSPEED byte
- MOV A,B ; Move baud rate byte from B to A
- OUT 6 ; Send baud rate divisor to Nuevo baud
- ; rate generator
- ENDIF ; (NUEVO AND NOT ROM145)
- ;
- IF (NUEVO AND NOT ROM145) AND DTRMOD
- MVI C,15H ; 16X clock, 8 DB 1 SB, RTS active
- ENDIF ; (NUEVO AND NOT ROM145) AND DTRMOD
- ;
- IF (NUEVO AND NOT ROM145) AND NOT DTRMOD
- MVI C,55H ; 16X clock, 8 DB 1 SB, RTS inactive
- ENDIF ; (NUEVO AND NOT ROM145) AND NOT DTRMOD
- ;
- IF (NUEVO AND NOT ROM145)
- MOV A,C
- STA BAUDRTE ; Save ACIA control byte
- ENDIF ; (NUEVO AND NOT ROM145)
- ;
- ;.....
- ;
- ;
- STBAUD: PUSH H
- CALL OSET
- POP H
- RET
- ;
- ;.....
- ;
- ;
- OSET: LHLD 1 ; Get bios+3 address
- MVI L,3CH ; Extended bios routine for baud rate select
- PCHL ; branch to it
- ;
- ;.....
- ;
- ;
- BAUDBUF:DB 10,0
- DS 10
- ;
- BAUDRTE: DB 0 ; RAM location for baud rate byte
- SSTAT: DB 0 ; RAM location serves as a secondary status register
- ; for 6850 ACIA status register.
- ; This RAM register is used because the 6850 ACIA
- ; clobbers its own internal status register
- ; (with regard to TBE and RDA status bits) when
- ; data is traveling in both directions via the
- ; serial port -- important for ascii text uploads.
- ;
- ;.....
- ;
- ;
- ; --- ROUTINES THAT ARE PLACED JUST UNDER BDOS AND OVERLAY THE CCP
- ;
- BDJ: JMP $-$ ; This gets patched to jump to bdos entry
- ;
- OSIN: LDA SSTAT ; Update SSTAT location in RAM
- ANI RMDRCV ; before inputing data
- STA SSTAT
- ;
- DI ; Disable interrupts
- OUT 0 ; Switch to alternate bank
- LDA MDDATP ; Get data input
- OUT 1 ; Switch to main bank
- EI ; Re-enable interrupts
- RET
- ;
- ;.....
- ;
- ;
- OSOUT: DI ; Disable interrupts
- OUT 0 ; Switch to alternate bank
- STA MDDATP ; Send data output
- OUT 1 ; Switch to main bank
- EI ; Re-enable interrupts
- ;
- LDA SSTAT ; Update SSTAT location in RAM
- ANI RMDSND ; after outputing data
- STA SSTAT
- RET
- ;
- ;.....
- ;
- ;
- OSTAT: DI ; Disable interrupts
- OUT 0 ; Switch to alternate bank
- LDA MDCTL1 ; Get status byte
- OUT 1 ; Switch to main bank
- EI ; Re-enable interrupts
- ;
- PUSH B ; Update SSTAT location in RAM
- MOV B,A ; using current ACIA status register
- LDA SSTAT ; and earlier ACIA status register
- ORA B
- STA SSTAT
- POP B
- RET
- ;
- ;.....
- ;
- ;
- IF (ROM145 AND NOT NUEVO)
- BRATE: DI ; disable interrupts
- OUT 0 ; Switch to alternate bank
- MOV A,B
- STA 2C01H ; Send data to 6821 control register
- MVI A,0EAH ; Reset video horizontal offset and DD bit
- STA 0EF61H ; Update BIOS RAM location
- STA 2C00H ; Output data byte to 6821 PIA
- OUT 1 ; Switch to main bank
- EI
- RET
- ENDIF ; (ROM145 AND NOT NUEVO)
- ;
- ;.....
- ;
- ;
- CDLEN EQU $-BDJ ; Length of code to relocate
- ;
- ; fini
- ;-----------------------------------------------------------------------
- ;
- ; NOTE: Must terminate by 0400H
- END