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- ; B3AP-2.INS - APPLE ][ with Mountain CPS Serial Card - 07/30/85
- ;
- ; 2651 with internal baudrate generator
- ;
- ; NOTE: This is an insert, not an overlay.
- ;
- ; WARNING: Carrier detect (DCD) from the modem must go to DSR input on
- ; the 2651 to provide proper operation for both autodialing
- ; and autoreceiving. If you use the DCD input, it requires
- ; voltage (normally unavailable) during dialing to allow
- ; result codes to be used.
- ;
- ; To build "a better modem cable", on the apple side of the cable,
- ; hook the following pins together:
- ; 5, 8, 20 - this will force CTS and DCD high when
- ; DTR is on.
- ; 6 - tie the real DCD (pin 8 on the modem)
- ; to this pin.
- ;
- ; This program assumes you use the DSR pin (80H) to check carrier
- ; from the modem.
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ; 07/30/85 Restored original format - pst
- ; 07/24/85 Fixed minor bug with 2400 baud setting - pst
- ; 01/20/84 Created overlay using BY2-2651.ASM - Norman Beeler
- ;
- ; = = = = = = = = = = = = = = = = = =
- ;
- ; Define the CPS card slot you are using (normally 1 or 2)
- ;
- SLOT EQU 2 ; CPM card slot
- ;
- ;=======================================================================
- ;
- ; Modem port equates
- ;
- DPORT EQU 0E0FAH+SLOT*100H ; Modem data port
- SPORT EQU 0E0FBH+SLOT*100H ; Modem status port
- XPORT EQU 0E0FEH+SLOT*100H ; Modem swap port
- ;
- ; Status port equates
- ;
- TBMT EQU 00000001B ; Transmit buffer empty
- DAV EQU 00000010B ; Data available
- DCD EQU 10000000B ; Data carrier detect
- ;
- ; Mode port equates
- ;
- EBASE EQU 30H ; Mode register 2 base
- B300 EQU EBASE+5 ; 300 baud
- B1200 EQU EBASE+7 ; 1200 bps
- B2400 EQU EBASE+10 ; 2400 bps
- ;
- ;-----------------------------------------------------------------------
- ;
- ; See if we still have a carrier - if not, return with the zero flag set
- ;
- MDCARCK:LDA SPORT ; Read port
- ANI DCD ; Check DSR for carrier (do not use DCD)
- RZ
- ORI 255
- RET
- ;
- ; Disconnect and wait for an incoming call
- ;
- MDINIT: MVI A,80H ; Open CPS command register
- STA XPORT ; By storing 80H in XPORT
- MVI A,15H ; Turn DTR off, modem will quit
- STA SPORT
- MVI B,20 ; 2 seconds to drop any carrier
- ;
- MDINIT1:CALL DELAY ; .1 second delay
- DCR B
- JNZ MDINIT1
- MVI A,17H ; With DTR on, modem accepts commands
- STA SPORT
- XRA A ; Close the command port
- STA XPORT ; By storing 0 in XPORT
- ;
- IF IMODEM
- CALL IMINIT ; Initialize smartmodem
- ENDIF ; IMODEM
- ;
- RET
- ;
- ; Input a character from the modem port
- ;
- MDINP: LDA DPORT ; Get character
- RET
- ;
- ; Check the status to see if a character is available. If not, return
- ; with the zero flag set. If yes, use 0FFH to clear the flag.
- ;
- MDINST: LDA SPORT ; Read port
- ANI DAV ; Check receive ready bit
- RZ ; Nope, nothing there
- ORI 255 ; We got something...
- RET
- ;
- ; Send a character to the modem
- ;
- MDOUTP: STA DPORT ; Send it
- RET
- ;
- ; See if the output is ready for another character
- ;
- MDOUTST:LDA SPORT ; Read port
- ANI TBMT ; Check transmit ready bit
- RZ
- ORI 255
- RET
- ;
- ; Reinitialize the modem and hang up the phone by dropping DTR and
- ; leaving it inactive.
- ;
- MDQUIT: IF IMODEM
- CALL IMQUIT ; Initialize modem to default settings
- ENDIF ; IF IMODEM
- ;
- ;
- ; Called by the main program after caller types BYE
- ;
- MDSTOP: MVI A,80H ; Open CPS command register
- STA XPORT ; By storing 80H in XPORT
- XRA A ; Turn DTR off, modem will quit
- STA SPORT
- CALL DELAY ; Let it stabilize
- RET
- ;
- ; The following routine sets the baudrate. BYE3 asks for the maximum
- ; speed you have available.
- ;
- SET300: CALL BSETUP
- MVI A,B300
- JMP FSETUP
- ;
- SET1200:CALL BSETUP
- MVI A,B1200
- JMP FSETUP
- ;
- SET2400:CALL BSETUP
- MVI A,B2400
- JMP FSETUP
- ;
- BSETUP: MVI A,80H
- STA XPORT
- MVI A,37H ; Initialize the serial chip
- STA SPORT ; By storing 37H in SPORT
- MVI A,4EH ; 1 stop, 8 bits, no parity
- STA DPORT
- XRA A
- RET
- ;
- FSETUP: STA DPORT
- XRA A
- STA XPORT ; Close command port by storing 0
- RET
- ; end
- ;-----------------------------------------------------------------------