mirror of https://github.com/callapple/LLUCE.git
336 lines
7.3 KiB
ArmAsm
336 lines
7.3 KiB
ArmAsm
TR
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TR ADR
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*-------------------------------
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* USRobotics 2400 driver written by Andy Nicholas
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* January 19, 1988
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*-------------------------------
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rel
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dsk rel/ssc
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cr equ $0d
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lf equ $0a
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data equ $c088
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status equ $c089
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command equ $c08a
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control equ $c08b
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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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*-------------------------------
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ssc ent
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org $b00
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* jump table
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*-------------------------------
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slot 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 answer
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jmp hangup
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jmp inp
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jmp out
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jmp chkdcd
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jmp setspd
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jmp raisedtr
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* init the serial card
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*-------------------------------
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init lda #0 ;reset bytes
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ldx slot
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sta status,x ;reset uart
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sta command,x ;reset command
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clc
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txa
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adc #<data
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sta dataloc+1 ;make into absolute save
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rts
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* setup for call
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*-------------------------------
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ringset ldx slot ;get offset
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lda #%00000000 ;kill DTR, RTS
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sta command,x
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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 #%00001011 ;turn on DTR, RTS
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sta command,x
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sei
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ldy initspd ;set init speed
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jsr setspd
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lda data,x ;clear data strobe
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lda #0 ;slight delay (let modem do init)
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jsr wait
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ldx #0
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:loop lda #$80
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jsr wait
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lda initstr,x ;get modem init string
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beq rset3
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jsr out ;output
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inx
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bne :loop
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rset3 lda #6
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sta countlo
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sta counthi
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rset4 ldy #$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 #'K' ;check for "OK"
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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 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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jring jmp ringset ;extend branch to ringset
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* scan for ring and handle it
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*-------------------------------
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ring jsr inp ;check for a char
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bcc ring5 ;nope...
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and #$7f ;strip high
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cmp #'E'
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clc
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bne ring5 ;keep checking
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ring2 jsr inp ;check for char
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bcc ring2
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ldy #0 ;def = 300 baud
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and #$7f ;strip high
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cmp #'R' ;oops, "No Carrier" message
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beq jring
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cmp #cr ;connect 300
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beq ring3
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cmp #'3' ;connect 300
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beq ring3
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iny
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cmp #'1' ;connect 1200
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beq ring3
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iny
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cmp #'2' ;connect 2400
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beq ring3
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iny
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cmp #'4' ;connect 4800
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beq ring3
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iny
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cmp #'9' ;connect 9600
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bne ring2
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ring3 jsr setspd ;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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sec ;we have a connection!
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ring5 rts
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* send ata to phone
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*-------------------------------
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answer ldx #0
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answer2 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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lda #$80
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jsr wait
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inx
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bne answer2 ;loop
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answer3 rts
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* hangup phone
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*-------------------------------
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hangup ldx slot ;get offset
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lda #0
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sta command,x ;hang up phone
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rts
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* input data
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*-------------------------------
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inp stx save_x ;save X
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ldx slot ;get offset
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lda status,x ;get status
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and #%00001000
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clc
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beq inp2 ;no data
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lda data,x
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sec
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inp2 ldx save_x ;restore & return
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rts
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* output data
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*-------------------------------
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out stx save_x ;save x
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dec timecnt ;count down 1 section
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bne out1
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inc bytcnt ;1 second gone by
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bit bytcnt
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bvc out1
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ldx #0 ;reset seconds
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stx bytcnt
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inc bytcnt+1 ;1 minute gone by
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bit bytcnt+1
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bvc out1
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ldx #0 ;reset minutes
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stx bytcnt+1
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inc bytcnt+2 ;1 hour gone by
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out1 ldx slot
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pha
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out2 lda status,x ;check status
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and #%00010000
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beq out2 ;loop until ready
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pla
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dataloc sta data ;self modified
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ldx save_x
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rts
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* check for carrier
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*-------------------------------
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chkdcd stx save_x ;dont kill any reg's
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pha
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ldx slot ;get offset
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lda status,x
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and cdbyte ;check carrier
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clc
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bne chkdcd2
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sec
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chkdcd2 pla restore ;all & return
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ldx save_x
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rts
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* set the rs-232 speed/speed in Y reg
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*-------------------------------
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setspd stx save_x
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ldx slot ;get offset
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lda speed,y ;get speed
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sta control,x ;set speed
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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 setspd3 ;yep
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asl callspd ;speed = speed * 2
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setspd2 asl callspd ;speed = speed * 2
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dey
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bne setspd2 ;loop until correct speed found
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setspd3 ldx save_x ;restore & return
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rts
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*-------------------------------
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* turn on dtr/rts
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raisedtr stx save_x
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ldx slot
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lda #%00001011 ;turn on DTR, RTS
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sta command,x
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sei
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ldx save_x
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rts
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* wait routine
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*-------------------------------
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wait sec
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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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* global data area
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*-------------------------------
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speed dfb %00010110 ;300
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dfb %00011000 ;1200
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dfb %00011010 ;2400
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dfb %00011100 ;4800
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dfb %00011110 ;9600
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dfb %00011111 ;19200
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timecnt dfb 0 ;1-second counter
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save_x dfb 0
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countlo dfb $FF
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counthi dfb $FF
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asc 'SSC'
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