; B3R2-2.INS - BYE3 Insert for TRS-80 2/12/16/16B - 08/01/85
;
; SIO I/O and CTC 8430 timer
;
; This version adapted for use with TRS-80 Models 2/12/16 & 16B.
;
; This works with the TRS-80 Model II & 12 with versions of CP/M 2.2
; except Pickles and Trout 2.2m. Will work on P&T 2.2m ONLY if running
; ZCPR3.
;
; NOTE: This is an insert, not an overlay.
;
;
; = = = = = = = = = = = = = = = = = =
;
; 08/01/85 Upgraded for bye337 - pst
; 12/23/84 Written for TRS-80 Models II//16/ and 16B - Ken Brown
;
; = = = = = = = = = = = = = = = = = =
;
;
; Set ports for SIO & CTC chips for TRS-80 Models 2/12/16/16B
;
; The following define the port addresses to use.
;
DPORT EQU 0F4H ; Data port
SPORT EQU DPORT+2 ; Status/control port
BPORT EQU 0F0H ; Baud rate port
BPORT1 EQU BPORT+1 ; Port for TRS-80 Models 2/12/16/16B
;
DCD EQU 00001000B ; Data carrier detect
TBMT EQU 00000100B ; Transmitt buffer empty
DAV EQU 00000001B ; Data available
;
; Changed BDCMD1 & BDCMD2 EQU'S for TRS-80 Models 2/12/16/16B
;
BDCMD1 EQU 07H ; 110,300,600 & 1200 baud
BDCMD2 EQU 47H ; 2400 4800 9600 baud
;
; CTC baud rate divisors
;
BD300 EQU 52 ; 300 baud
BD1200 EQU 104 ; 1200 baud
BD2400 EQU 52 ; 2400 baud
;
;-----------------------------------------------------------------------
;
; See if we still have a carrier - if not, return with the zero flag set
;
MDCARCK:MVI A,10H ; Reset status
OUT STPORT
IN STPORT ; Get status
ANI DCD ; Check for data carrier
RZ
ORI 255
RET
;
; Disconnect and wait for an incoming call
;
MDINIT: MVI A,18H ; Reset channel
OUT STPORT
MVI A,4 ; Setup to write register 4
OUT STPORT
MVI A,44H ; 1 stop, 8 bits, no parity
OUT STPORT
MVI A,1 ; Setup to write register 1
OUT STPORT
MVI A,00H
OUT STPORT
MVI A,5 ; Setup to write register 5
OUT STPORT
MVI A,68H ; Clear DTR causing hangup
OUT STPORT
;
PUSH B
MVI B,20 ; 2 second delay
OFFTI: CALL DELAY ; 0.1 second delay
DCR B
JNZ OFFTI ; Keep looping until finished
POP B ; Restore BC
;
MVI A,3 ; Setup to write register 3
OUT STPORT
MVI A,0C1H ; Initialize receive register
OUT STPORT
MVI A,5 ; Setup to write register 5
OUT STPORT
MVI A,0EAH ; Turn on DTR so modem can answer phone
OUT STPORT
;
IF IMODEM ; If using hayes 300/1200 smartmodem
CALL IMINIT ; Go initialize smartmodem now
ENDIF ; Smodem
;
RET ; Return
;
; Input a character from the modem port
;
MDINP: IN PORT ; Get character
RET ; Return
;
; 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 STPORT ; Get status
ANI DAV ; Check the receive ready bit
RZ ; Return if none
ORI 255 ; Otherwise, set the proper flag
RET ; And return
;
; Send a character to the modem
;
MDOUTP: OUT PORT ; Send it
RET
;
; See if the output is ready for another character
;
MDOUTST:IN STPORT
ANI TBMT ; Check the 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 ; If using a smartmodem
CALL IMQUIT ; Tell it to shut down
ENDIF ; IMODEM
;
;
; Called by the main program after caller types BYE
;
MDSTOP: MVI A,5 ; Setup to write register 5
OUT STPORT
MVI A,68H ; Clear DTR causing shutdown
OUT STPORT
XCHG ; Give it time to react
XCHG
RET
;
; The following routine sets the baudrate. BYE3 asks for the maximum
; speed you have available.
;
SET300: MVI B,BD300 ; Load rate
MVI A,BDCMD1 ; Get first byte of command
JMP SETBAUD
;
SET1200:MVI B,BD1200
MVI A,BDCMD2
JMP SETBAUD
;
SET2400:MVI B,BD2400
MVI A,BDCMD2
;
SETBAUD:OUT BPORT ; Send CTC command word
OUT BPORT1
MOV A,B ; Get the baudrate value
OUT BPORT ; Send rate
OUT BPORT1
XRA A ; Say rate is ok
RET
; end
;------------------------------------------------------------------------
