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NUNH2-1.IQS
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nunh2-1.ins
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Text File
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1986-04-25
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3KB
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136 lines
; NUNH2-1.INS - NUBYE insert for Northstar Horizon Computers - 04/21/86
;
; 8251A I/O on 2nd Serial Port of Northstar Horizon
; Supports 300 and 1200 baud automatic switching
;
; Note: This is an insert, not an overlay.
;
; ========
;
; 04/21/86 Modified for NUBYE
; 08/30/85 Written to work with Northstar Horizon - Adam Grow
; 07/17/85 Written to work with BYE5 - Irv Hoff
; 03/30/85 Written for Morrow Micro Decision Computers - Jim Sinning
;
; ========
;
;The following define the port address to use
;
PORT EQU 4 ; Data port
MDCTL1 EQU PORT+1 ; Status/control port
STPORT EQU 6 ; Motherboard status port supports
; carrier detect
;
; NOTE: The baud rate header for the 2nd Serial Port must be wired for
; 1200 baud and the configuration header for the 2nd Serial Port must
; be wired as a terminal (not modem) for this to work.
;
BPORT EQU MDCTL1 ; Baud rate port=8251 control
CPORT EQU MDCTL1 ; Control port=8251 control
MODINS1 EQU 4EH ; 8 bits, 1 stop, 64x, no parity
;
; See if we still have a carrier - if not, return with the zero flag set
;
MDCARCK:IN STPORT ; Get status from motherboard status port
ANI 10H ; Check CD bit for a carrier
CPI 10H ; Set zero flag if no carrier
RET
;
; Disconnect and wait for an incoming call
;
MDINIT: MVI A,10H ; Clear DTR
OUT MDCTL1 ; Causing hangup
PUSH B ; Preserve in case we need it
MVI B,20 ; 2 second delay
;
OFFTI: CALL DELAY ; 0.1 second delay
DCR B
JNZ OFFTI ; Keep looping until finnished
POP B ; Restore BC
MVI A,17H ; Assert DTR so that modem
OUT MDCTL1 ; Can answer phone
CALL UDELAY ; Added to be safe
;
IF IMODEM
CALL IMINIT
ENDIF ; IMODEM
;
RET
;
; Input a character from the modem port
;
MDINP: IN PORT ; 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: IN MDCTL1 ; Get status
ANI 2 ; Check the receive ready bit
RZ ; Return if none
ORI 0FFH ; We have a character
RET
;
; Send a character to the modem
;
MDOUTP: OUT PORT ; Send it
RET
;
; See if the output is ready for another character
;
MDOUTST:IN MDCTL1
ANI 1 ; Check the transmit ready bit
RET
;
; Reinitialize the modem and hang up the phone by dropping DTR and
; leaving it inactive.
;
MDQUIT: IF IMODEM
CALL IMQUIT ; Tell smartmodem to quit
ENDIF ; IMODEM
;
; Called by the main program after caller types BYE
;
MDSTOP: MVI A,10H ; Turn off DTR
OUT MDCTL1
RET
;
; The following routine sets the baudrate. BYE5 asks for the maximum
; speed you have available.
;
SET2400 EQU $ ; Only supports 300/1200
;
SETINV: ORI 0FFH ; Make sure zero flag not set
RET
;
SET300: MVI B,BD300
JMP SETBAUD
;
SET1200:MVI B,BD1200
;
SETBAUD:MVI A,47H ; Reset, enable Rx, DTR, Tx
OUT MDCTL1 ; Rx,Tx enabled
CALL UDELAY
MOV A,B ; Recover Baud Rate Word
OUT BPORT
CALL UDELAY ; Wait for USART
MVI A,17H ; ERR reset, DTR, Rx, Tx all on
OUT MDCTL1
CALL UDELAY
XRA A ; Say rate OK
RET
;
; Values to switch the 8251 between x16 and x64
;
BD300 EQU 4FH ; 300 baud
BD1200 EQU 4EH ; 1200 bps
;
; IN8251 specific USART delay
;
UDELAY: NOP
NOP
NOP
RET
;
; end of insert
; -------------