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505 lines
7.2 KiB
Plaintext
505 lines
7.2 KiB
Plaintext
* GS Port Driver Bios - Slot #2
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* written by Andy Nicholas on July 26, 1987
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*-------------------------------
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rel
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dsk rel/gsport2
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cr equ $0d
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lf equ $0a
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initstr equ $10d0
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ansstr equ $10c0
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cdbyte equ $10bf
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Buffer equ $10b0
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*-------------------------------
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gsport2 ent
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* Jump Table
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*-------------------------------
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org $b00
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hex 20 ;serial card slot * 16
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initspd hex 00
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callspd dfb 0 ;speed of call
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bytcnt dfb 0,0,0
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jmp init
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jmp ringset
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jmp ring
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jmp answerRing
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jmp hangup
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jmp inp
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jmp out
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jmp getcarr
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jmp setspeed
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jmp raisedtr
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doinit jmp $c200
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doread jmp $c200
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dowrite jmp $c200
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dostatus jmp $c200
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doext jmp $c200
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* init the serial port pascal locations
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*-------------------------------
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init lda $c20d ;get init address
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sta doinit+1
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lda $c20e ;get read address
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sta doread+1
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lda $c20f ;get write address
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sta dowrite+1
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lda $c210 ;get status address
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sta dostatus+1
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lda $c212
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sta doext+1
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rts
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* input data
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*-------------------------------
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inp phx ;save x
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phy
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ldx #$c2 ;are we ready?
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ldy #$20
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lda #1
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jsr dostatus
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bcc inp2 ;nope, exit
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ldx #$c2 ;yes, read
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ldy #$20
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jsr doread
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sec
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ply
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plx ;restore & return
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rts
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inp2 lda #0
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clc
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ply
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plx
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rts
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* output data
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*-------------------------------
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out phx ;save x
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phy ;save y
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pha ;save a
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out1 ldx #$c2 ;ready for send?
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ldy #$20
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lda #$00
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jsr dostatus
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bcc out1 ;nope
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pla ;get a
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ldx #$c2
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ldy #$20
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jsr dowrite ;send it
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ply ;get y
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plx ;get x
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rts
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* setup for call
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*-------------------------------
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ringset jsr hangup
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lda #0 ;let modem reset
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jsr wait
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jsr wait
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lda #$00
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jsr gsdtr
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ldy initspd ;set init speed
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jsr setspeed
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lda #0 ;slight delay (let modem do init)
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jsr wait
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ldx #$FF
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rset2 inx do ;pre-inc
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lda initstr,x ;get modem init string
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beq rset3 ;we are done
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jsr out ;output
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bra rset2 ;loop (Z-bit set after wait)
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rset3 lda #6
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sta countlo
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sta counthi
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rset4 ldy #$FF
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rset5 dey
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beq decount
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jsr inp
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bcc rset5
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and #$7f
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cmp #'0' ;check for "0" result
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beq leave
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jmp rset5
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decount dec countlo
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bne rset4
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dec counthi
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bne rset4
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jmp ringset
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leave jsr inp ;grab the <cr> off the tail end of the "0"
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bcc leave
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jsr clearBuffer
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lda #0
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sta bytcnt ;reset byte counter
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sta bytcnt+1
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sta bytcnt+2
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clc
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rts ;return
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*-------------------------------
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* test for a ring and handle it
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ring jsr inp ;check for a char
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bcc noRing ;nope...
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and #$7f ;strip high
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cmp #'2' ;is it a 'ring'? (numeric)
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bne notRing ;nope, check for connect messages
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********************************
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grabCR jsr inp ;grab the <cr> off the tail end of the "2"
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bcc grabCR
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answerRing jsr answer ;the phone rang, so send 'ATA'
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clc
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rts
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********************************
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notRing
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cmp #'1' ;is it a '1' or '10' or '11' or '12' or '14'?
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beq gotCode ;yes, save it
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cmp #'5' ;is it connect 1200?
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bne noRing ;nope
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gotCode sta code
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secondChar jsr inp ;second character will ALWAYS be there
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bcc secondChar
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and #$7f ;strip high
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cmp #cr ;but might be a <cr>
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bne multiCode
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********************************
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singleCode ldy #0 ;connect 300?
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lda code
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cmp #'1'
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beq ring3
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iny
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cmp #'5' ;connect 1200?
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beq ring3 ;nope, unknown code, keep checking
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jmp noRing
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********************************
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multiCode
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sta code+1
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ldy #2 ;def = 2400 baud
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lda code ;get the first code char
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cmp #'1' ;must be a one
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bne noRing ;if not, then keep trying
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lda code+1 ;is it 2400?
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cmp #'0'
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beq ring3
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iny
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cmp #'1' ;is it 4800?
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beq ring3
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iny
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cmp #'2' ;is it 9600
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beq ring3
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iny
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cmp #'4' ;is it 19200?
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beq ring3
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dey
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cmp #'7' ;is it 9600/ARQ?
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beq ring3
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dey ;no 4800/arq
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dey
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cmp #'6'
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beq ring3 ;2400/ARQ
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dey
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cmp #'5' ;1200/ARQ
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beq ring3
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jmp noRing
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********************************
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ring3 jsr setspeed ;set the correct speed
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ldy #5
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ring4 lda #0 ;let carrier's settle
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jsr wait
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dey
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bne ring4
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jsr clearBuffer ;remove any garbage
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sec ;we have a connection!
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rts
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noring clc
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rts
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*-------------------------------
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* clear the input buffer
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clearBuffer
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lda #Flush_List
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ldx #>Flush_List
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ldy #0
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jmp doext
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* set DTR on GS Serial Port, and hangup if needed
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*-------------------------------
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hangup lda #$80 ;blow 'em off (hangup)
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gsdtr sta DTRstate
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lda #DTR_List
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ldx #>DTR_List
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ldy #0
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jmp doext
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* wait routine
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*-------------------------------
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wait sec ;from apple ][+ ref man - pg 147
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wait2 pha
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wait3 sbc #1
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bne wait3
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pla
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sbc #1
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bne wait2
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rts
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* Check for carrier using Get_Port_Stat routine
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*-------------------------------
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getcarr phx
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phy
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lda #carrlist
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ldx #>carrlist
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ldy #0
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jsr doext
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lda carrbits
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and cdbyte
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beq nocarr
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sec
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ply
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plx
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rts
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nocarr clc
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ply
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plx
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rts
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* send ata to phone
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*-------------------------------
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answer lda #$80
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jsr wait
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ldx #$ff
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answer2 inx
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lda ansstr,x ;get text
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beq answer3 ;we are done
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jsr out ;send it
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bra answer2
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answer3 rts
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* set the rs-232 speed [speed offset in Y]
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*
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* 0 = 300 baud
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* 1 = 1200 baud
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* 2 = 2400 baud
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* 3 = 4800 baud
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* 4 = 9600 baud
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* 5 = 19200 baud
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*-------------------------------
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setspeed phx
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phy
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lda #1 ;find caller speed (x300)
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sta callspd
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cpy #0 ;at 300?
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beq Do_Baud ;yep
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asl callspd ;speed = speed * 2
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setspeed2 asl callspd ;speed = speed * 2
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dey
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bne setspeed2 ;loop until correct speed found
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Do_Baud pla ;get y-reg
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asl a
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tay
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lda baudAddresses,y
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sta Baudread+1
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lda baudAddresses+1,y
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sta Baudread+2
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SetBaud ldx #$c2
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ldy #$20
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jsr doinit
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ldx #0
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Baudread lda $ffff,x
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beq Fin_Init
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jsr out
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inx
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bra Baudread
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Fin_Init ldx #0
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Init_Loop lda Port_Init,x
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beq donebaud
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jsr out
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inx
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bra Init_Loop
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donebaud lda #Out_Buf
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ldx #>Out_Buf
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ldy #0
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jsr doext
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plx
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rts
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********************************
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baudAddresses
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da Baud300
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da Baud1200
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da Baud2400
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da Baud4800
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da Baud9600
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da Baud19200
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*-------------------------------
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* raise dtr
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raisedtr lda #0
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phx
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phy
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jsr gsdtr
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ply
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plx
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rts
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* globals
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*-------------------------------
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counthi db 0
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countlo db 0
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Baud300 hex 01
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asc '6B'
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hex 00 ;accept 300 Baud
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Baud1200 hex 01
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asc '8B'
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hex 00 ;accept 1200 Baud
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Baud2400 hex 01
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asc '10B'
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hex 00 ;accept 2400 Baud
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Baud4800 hex 01
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asc '12B'
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hex 00 ;accept 4800 Baud
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Baud9600 hex 01
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asc '14B'
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hex 00 ;accept 9600 Baud
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Baud19200 hex 01
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asc '15B'
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hex 00 ;accept 19200 baud
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Port_Init
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hex 01
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asc '0D' ;8 bits
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hex 01
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asc '2P' ;no parity
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hex 01
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asc 'AD' ;auto-tabbing
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hex 01
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asc 'XD' ;no xoff recognition
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hex 01
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asc 'FD' ;no find keyboard
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hex 01
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asc 'CD' ;no column overflow
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hex 01
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asc 'ED' ;echo disabled
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hex 01
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asc 'MD' ;no lf masking
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hex 01
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asc 'BE' ;buffering enabled
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hex 01
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asc 'Z'
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hex 00 ;no more control characters
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*-------------------------------
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Out_Buf hex 04 ;Parameters to set the
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hex 13 ;Output buffer
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da 0
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adrl Buffer ;Buffer it where
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da 2 buffer 2 bytes
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*-------------------------------
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Carrlist hex 03 ;Parameter list for
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hex 06 ;detecting carrier drop
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da 0
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carrbits da 0 Carrier status here
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*-------------------------------
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DTR_List hex 03 ;Parameter list for
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hex 0b ;setting DTR
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da 0
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DTRstate da 0 bit 7 effects DTR
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*-------------------------------
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Flush_List hex 02 ;parameter list for flushing input queue
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hex 14
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da 0
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*-------------------------------
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code ds 2 ;2 byte code returned by modem
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asc 'GSPort2'
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