Initial GS implementation - blurts random text on the GS at first
This commit is contained in:
David Schmidt
parent
0e1c6a3eed
commit
3f01279bc6
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@ -0,0 +1,592 @@
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PTR = $06
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PTRL = $06
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PTRH = $07
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SPINIDX = $07
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BASEL = $28
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CSWL = $36
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CSWH = $37
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KSWL = $38
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KSWH = $39
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RNDL = $4E
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RNDH = $4F
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MOUROM = $C4
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MOUINDEX = $04
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MOUSLOT = $40
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CEVL = $3CE
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CEVH = $3CF
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OUTVECT0 = $BE10
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OUTVECT3 = $BE16
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INVECT0 = $BE20
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INVECT3 = $BE26
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VECTOUT = $BE30
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VECTIN = $BE32
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WARMDOS = $BE00
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TEXTSCRN = $0400
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WAIT = $FCA8
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BELL1 = $FBD9
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COUT1 = $FDF0
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KEYBD = $C000
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KBCLR = $C010
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ANYKEY = $C010
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;---------------------------------------------------------
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; Apple IIgs SCC Z8530 registers and constants
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;---------------------------------------------------------
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GSCMDB = $C038
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GSDATAB = $C03A
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GSCMDA = $C039
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GSDATAA = $C03B
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RESETB = %01010001 ; constant to reset Channel B
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WR11A = %11010000 ; init wr11 in Ch A
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WR11BXTAL = %00000000 ; init wr11 in Ch B - use external clock
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WR11BBRG = %01010000 ; init wr11 in Ch B - use baud rate generator
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.org $9600
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CLD
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;
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; SLOTS FOR MOUSE AND SERIAL ON IIGS ARE WELL KNOWN
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;
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;
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; RESET ENTRYPOINT
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;
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ENTRY: CLI
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;
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; INIT MOUSE
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;
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INITMOU:
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LDY #$19 ; INIT MOUSE
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JSR CALLMOU
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LDY #$12 ; SET MOUSE
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LDA #$01 ; TRANSPARENT MODE
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JSR CALLMOU
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LDA #$00
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STA $478
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STA $4F8
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LDA #$C0
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STA $578
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LDA #$3F
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STA $5F8
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LDY #$17 ; CLAMP MOUSE
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LDA #$00 ; X AXIS
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JSR CALLMOU
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LDY #$17 ; CLAMP MOUSE
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LDA #$01 ; Y AXIS
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JSR CALLMOU
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;
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; INIT SCC MODEM PORT FOR 115K BAUD
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;
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INITSCC:
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SEI ; No interruptions here!
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LDA GSCMDB ; Hit rr0 once to sync up
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LDY #$00
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SCCREGS:
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LDA SCCTAB,Y
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STA GSCMDB
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INY
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LDA SCCTAB,Y
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STA GSCMDB
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INY
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CPY SCCTABLEN
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BNE SCCREGS
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CLI ; we're done!
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;
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; SYNCHRONIZE WITH PI
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;
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SYNC: LDA #$80
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JSR SENDACC
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INC SPINIDX
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LDA SPINIDX
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AND #$03
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TAX
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LDA SPINNER,X
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STA TEXTSCRN
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LDA #$FF
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JSR WAIT
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LDA KEYBD
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BPL CHKACK
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JMP EXIT
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CHKACK: ; Read a byte from SCC
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LDA GSCMDB ; dummy read to reset SCC pointer to 0
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SYNCLUP:
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BIT $C0E0 ; attempt to slow down accelerators by referencing slot 6 ($C080 + $60)
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LDA GSCMDB ; read SCC register 0
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AND #$01 ; bit 0 means receive available
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CMP #$01
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BNE SYNC
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SYNCRDY:
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LDA #$01 ; set pointer to rr1
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STA GSCMDB
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LDA GSCMDB ; read SCC register 1
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AND #$20 ; check for bit 5=rx overrun
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BEQ SYNCOK
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LDX #$30 ; clear overrun
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STX GSCMDB
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LDX #$00
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STX GSCMDB
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SYNCOK: LDA #$08 ; get ready to read rr8 (our SCC byte)
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STA GSCMDB
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LDA GSCMDB ; read it
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CMP #$81
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BNE SYNC
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LDY #$20 ; Tell 'em about slot 2
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STY $301 ; TELL CALLING PROGRAM SYNC OK
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LDA #$A0
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STA TEXTSCRN ; Clear the spinner out
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LDA #$87
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JSR BELL1
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LDA ANYKEY
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STA KEYSTAT
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;
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; GET COUT/CIN VECTORS
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;
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JSR $C300
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LDA CSWL
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STA CHAINOUT+1
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LDA CSWH
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STA CHAINOUT+2
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JSR HOOK
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;
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; SET VECTOR FOR CHKEVENT
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;
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; LDX #<CHKEVENT
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; STX CEVL
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; LDX #>CHKEVENT
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; STX CEVH
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;
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; SET UP RESET VECTOR
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;
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LDA RESET+1
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BNE ISRESET
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LDA $3F2
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STA RESET
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LDA $3F3
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STA RESET+1
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LDA #<ENTRY
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STA $3F2
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LDA #>ENTRY
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STA $3F3
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EOR #$A5
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STA $3F4
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RTS
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ISRESET:
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LDX #$FF
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TXS
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JMP WARMDOS
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;
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; CHAR OUT HOOK - CHECK ONCE FOR A2PI EVENTS
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;
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COUTPI: PHP
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CLI
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PHA
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STX SAVEX
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STY SAVEY
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LDA #$98
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JSR SENDACC
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PLA
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PHA
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JSR SENDACC
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JSR SENDACC
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LDA CHRIN
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BNE COUTNXT ; SKIP IF INPUT CHAR PENDING
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LDA KEYBD
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CMP #$83 ; SKIP CTRL-C
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BEQ COUTNXT
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CMP #$93 ; SKIP CTRL-S
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BEQ COUTNXT
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LDA #$01
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STA WAITEV
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JSR CHKEVENT ; CHECK ON EVENTS
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BCC COUTNXT
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STA CHRIN
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COUTNXT:
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PLA
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LDY SAVEY
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LDX SAVEX
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PLP
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STA SAVEY
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CHAINOUT:
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JSR COUT1
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;
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; SET INPUT/OUTPUT VECTORS
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;
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HOOK: STX SAVEX
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LDX #<COUTPI
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STX CSWL
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LDX #>COUTPI
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STX CSWH
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LDX #<CINPI
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STX KSWL
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LDX #>CINPI
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STX KSWH
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LDX SAVEX
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RTS
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;
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; CHAR IN HOOK - EVENT LOOP FOR A2PI DAEMON
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;
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CINPI: STA (BASEL),Y ; RESTORE CURSOR
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LDA CHRIN
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BNE CINPIEX
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STX SAVEX
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LDA #$5F ; PRINT _
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JSR CHAINOUT
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LDA #$88 ; BACKSAPCE
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JSR CHAINOUT
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PHP
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CLI
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EVENTLP:
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INC RNDL ; UPDATE RND LIKE ANY PROPER RDKEY
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BNE EVENTLP1
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INC RNDH
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EVENTLP1:
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JSR CHKEVENT
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BCC EVENTLP
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PLP ; HAVE CHAR FROM A2PI DAEMON
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LDX SAVEX
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CINPIEX:
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LDY #$00
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STY CHRIN
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RTS
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;
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; SEND MODIFIER (OPEN & CLOSED APPLE) KEYS/PADDLE BUTTONS
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;
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SENDMOD:
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LDA $C062
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ASL
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LDA $C061
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ROR
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AND #$C0 ; FALL THROUGH
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;
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; ACIA SEND BYTE IN ACCUMULATOR
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;
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SENDACC:
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STA SAVEY
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STX SAVEX
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SCCSEND:
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LDA GSCMDB
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TAX
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AND #%00000100 ; test bit 2 (hardware handshaking)
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BEQ SCCSEND
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TXA
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AND #%00100000 ; test bit 5 (ready to send?)
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BEQ SCCSEND
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LDA SAVEY ; ready... get the byte to send
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STA GSDATAB ; send the byte
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LDX SAVEX
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LDA SAVEY
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RTS
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;
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; SCC RECEIVE BYTE IN ACCUMULATOR
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;
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RECVACC:
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LDA GSCMDB ; dummy read to reset SCC pointer to 0
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RECVLUP:
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BIT $C0E0 ; attempt to slow down accelerators by referencing slot 6 ($C080 + $60)
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LDA GSCMDB ; read SCC register 0
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AND #$01 ; bit 0 means receive available
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CMP #$01
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BNE RECVLUP
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RECVRDY:
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LDA #$01 ; set pointer to rr1
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STA GSCMDB
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LDA GSCMDB ; read SCC register 1
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AND #$20 ; check for bit 5=rx overrun
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BEQ RCVOK
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LDX #$30 ; clear overrun
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STX GSCMDB
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LDX #$00
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STX GSCMDB
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RCVOK: LDA #$08 ; get ready to read rr8 (our SCC byte)
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STA GSCMDB
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LDA GSCMDB ; read it
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CLC
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RTS
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;
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; CHECK INPUT STATE FOR CHANGE
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;
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CHKEVENT:
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LDA ANYKEY ; CHECK FOR KEY PRESS/RELEASE
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CMP KEYSTAT
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BNE SENDKEY
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LDA GSCMDB
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BIT $C0E0
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LDA GSCMDB
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AND #$01
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CMP #$01
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BNE CHKMOU ; no data; check for mouse
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JSR RECVRDY
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JMP HOSTREQ
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CHKMOU: DEC WAITEV ; CHECK FOR MOUSE UPDATE
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BEQ UPDTMOU
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EXEVENT:
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CLC
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RTS
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;
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; KEYBOARD EVENT
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;
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SENDKEY:
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TAX
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BPL SENDKBEV
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LDA #$80 ; DEBOUNCE KEYPRESS
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JSR WAIT
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LDX ANYKEY
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CPX #$FF
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BNE SENDKBEV
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LDA $C062
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BPL SENDKBEV
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LDA $C061
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BPL SENDKBEV
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UNHOOK: JSR EXIT
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LDA #$00
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STA RESET
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STA RESET+1
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LDA #$0D
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SEC
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RTS
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SENDKBEV:
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STX KEYSTAT
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LDA #$82 ; KBEVENT CODE
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JSR SENDACC
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JSR SENDMOD
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TXA
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CLC
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JMP SENDACC
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;
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; MOUSE EVENTS
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;
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UPDTMOU:
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LDY #$14 ; READ MOUSE
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LDA #$80
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JSR CALLMOU
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BCC EXMOU
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LDY #MOUINDEX
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LDA $478,Y
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STA MOUXSTAT
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LDA $4F8,Y
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STA MOUYSTAT
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LDA $778,Y
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PHA
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LDY #$15 ; CLEAR MOUSE
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LDA #$80
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JSR CALLMOU
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LDA MOUXSTAT
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ORA MOUYSTAT
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BEQ CHKBTTN
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LDA #$84 ; SEND MOUSE POSITION
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JSR SENDACC
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LDA MOUXSTAT
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JSR SENDACC
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LDA MOUYSTAT
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JSR SENDACC
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CHKBTTN:
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LDY #MOUINDEX
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PLA
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STA $778,Y ; GS CLEARS THIS IN CLEAR MOUSE CALL
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AND #$80
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CMP BTTNSTAT
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BEQ EXMOU
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SENDBTTN:
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STA BTTNSTAT
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LDA #$86
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JSR SENDACC
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JSR SENDMOD
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LDA BTTNSTAT
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JSR SENDACC
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EXMOU: CLC
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RTS
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;
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; CALL MOUSE FIRMWARE
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;
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CALLMOU:
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LDX #MOUROM
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PHA
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LDA PTRL ; SAVE ZERO PAGE LOCATIONS
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STA SAVEZP
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LDA PTRH
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STA SAVEZP+1
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LDA #$00
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STA PTRL
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STX PTRH
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LDA (PTR),Y
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STA PTRL
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PLA
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LDX #MOUROM
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LDY #MOUSLOT
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PHP
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SEI
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JSR IJMP
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PLP
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LDA SAVEZP ; RESTORE ZERO PAGE LOCATIONS
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STA PTRL
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LDA SAVEZP+1
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STA PTRH
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SEC ; MOUSE PRESENT FLAG
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RTS
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;
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; HOST REQUEST/RESPONSE HANDLING
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;
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RECVADDR:
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JSR SENDACC ; ECHO REQUEST
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JSR SENDACC ; DUMMY VALUE
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JSR SENDACC ; DUMMY VALUE
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JSR RECVACC
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STA PTRL
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TXA ; ACK
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JSR SENDACC
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JSR RECVACC
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STA PTRH
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TXA ; ACK
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JMP SENDACC
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RECVCNT:
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JSR RECVACC
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STA CNTL
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TXA ; ACK
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JSR SENDACC
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JSR RECVACC
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STA CNTH ; INC FOR LOOP CONTROL
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INC CNTH
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TXA ; ACK
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JMP SENDACC
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HOSTREQ:
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LDX PTRL ; SAVE ZERO PAGE LOCATIONS
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STX SAVEZP
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LDX PTRH
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STX SAVEZP+1
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READREQ:
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CMP #$90 ; READ BYTES
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BNE WRITEREQ
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LDX #$91
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JSR RECVADDR
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JSR RECVCNT
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LDX #$00
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READLP: LDA (PTR,X)
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JSR SENDACC
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INC PTRL
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BNE READDEC
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INC PTRH
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READDEC:
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DEC CNTL
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BNE READLP
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DEC CNTH
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BNE READLP
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BEQ OKREQ
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WRITEREQ:
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CMP #$92 ; WRITE BYTES
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BNE CALLREQ
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SEI ; DISABLE INTERRUPTS
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LDX #$93
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JSR RECVADDR
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JSR RECVCNT
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LDX #$00
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WRITELP:
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JSR RECVACC
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STA (PTR,X)
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INC PTRL
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BNE WRITEDEC
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INC PTRH
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WRITEDEC:
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DEC CNTL
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BNE WRITELP
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DEC CNTH
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BNE WRITELP
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BEQ OKREQ
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CALLREQ:
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CMP #$94
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BEQ CALLREQ1
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CMP #$9A
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BNE CINREQ
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CALLREQ1:
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TAX
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INX
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JSR RECVADDR
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JSR IJMP
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OKREQ: LDX #$9E ; REQ COMPLETE OK
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SENDCOMP:
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CLI ; ENABLE INTERRUPTS
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PHP
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PHA
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TXA
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JSR SENDACC
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PLA
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JSR SENDACC ; ACCUM VALUE
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PLA
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JSR SENDACC ; FLAGS VALUE
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LDA SAVEZP ; RESTORE ZERO PAGE LOCATIONS
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STA PTRL
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LDA SAVEZP+1
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STA PTRH
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EXREQ: CLC
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RTS
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CINREQ: CMP #$96
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BNE RESYNC
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LDX #$97
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JSR RECVADDR
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LDA #$9E ; REQ COMPLETE OK
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JSR SENDACC
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LDA PTRL
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LDX SAVEZP ; RESTORE ZERO PAGE LOCATIONS
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STX PTRL
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LDX SAVEZP+1
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STX PTRH
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JSR SENDACC ; ECHO VALUE
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JSR SENDACC ; ECHO VALUE
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SEC ; RETURN CHAR TO RDKEY
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RTS
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RESYNC: CMP #$80 ; RESYNC WITH HOST
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BNE BADREQ
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JSR SENDACC ; ECHO
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JSR RECVACC
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CMP #$81
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BEQ EXREQ
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; JMP UNHOOK
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BNE RESYNC
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BADREQ: LDX #$9F ; REQ BAD
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BNE SENDCOMP
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||||
;
|
||||
; CLEANUP
|
||||
;
|
||||
EXIT: LDA KBCLR
|
||||
JSR $C300
|
||||
LDA RESET+1
|
||||
BEQ EX1
|
||||
STA $3F3
|
||||
EOR #$A5
|
||||
STA $3F4
|
||||
LDA RESET
|
||||
STA $3F2
|
||||
EX1: LDY #$12 ; SET MOUSE
|
||||
LDA #$00 ; DISABLE MOUSE
|
||||
STA RESET
|
||||
STA RESET+1
|
||||
JMP CALLMOU
|
||||
IJMP: JMP (PTR)
|
||||
MOUXSTAT: .byte 0
|
||||
MOUYSTAT: .byte 0
|
||||
BTTNSTAT: .byte 0
|
||||
KEYSTAT: .byte 0
|
||||
WAITEV: .byte 0
|
||||
CNTL: .byte 0
|
||||
CNTH: .byte 0
|
||||
RESET: .word 0
|
||||
SAVEZP: .word 0
|
||||
SAVEX: .byte 0
|
||||
SAVEY: .byte 0
|
||||
CHRIN: .byte 0
|
||||
SPINNER: .byte $af, $ad, $dc, $fc ; "/-\|" (i.e. rotate clockwise)
|
||||
SCCTABLEN:
|
||||
.byte 24 ; Number of bytes to follow
|
||||
SCCTAB: .byte 9, RESETB
|
||||
.byte 3, %11000000
|
||||
.byte 5, %01100010
|
||||
.byte 14, %00000000
|
||||
.byte 4, %10000100
|
||||
.byte 11, WR11BXTAL
|
||||
.byte 3, %11000001
|
||||
.byte 5, %01101010
|
||||
.byte 15, %00000000
|
||||
.byte 0, %00010000 ; Need this twice
|
||||
.byte 0, %00010000 ; Need this twice
|
||||
.byte 1, %00000000
|
||||
Binary file not shown.
Loading…
Reference in New Issue