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147 lines
2.4 KiB
ArmAsm
147 lines
2.4 KiB
ArmAsm
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; Ullrich von Bassewitz, 13.09.2001
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; Keyboard polling stuff for the 510.
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;
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.export k_scnkey
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.importzp tpi2, ktab1, ktab2, ktab3, ktab4
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.include "zeropage.inc"
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.include "io.inc"
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.include "page3.inc"
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.proc k_scnkey
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lda #$FF
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sta ModKey
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sta NorKey
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lda #$00
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sta KbdScanBuf
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ldy #tpiPortB
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sta (tpi2),y
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ldy #tpiPortA
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sta (tpi2),y
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jsr Poll
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and #$3F
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eor #$3F
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bne L1
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jmp NoKey
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L1: lda #$FF
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ldy #tpiPortA
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sta (tpi2),y
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asl a
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ldy #tpiPortB
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sta (tpi2),y
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jsr Poll
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pha
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sta ModKey
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ora #$30
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bne L3 ; Branch always
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L2: jsr Poll
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L3: ldx #$05
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ldy #$00
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L4: lsr a
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bcc L5
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inc KbdScanBuf
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dex
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bpl L4
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sec
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ldy #tpiPortB
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lda (tpi2),y
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rol a
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sta (tpi2),y
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ldy #tpiPortA
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lda (tpi2),y
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rol a
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sta (tpi2),y
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bcs L2
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pla
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bcc NoKey ; Branch always
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L5: ldy KbdScanBuf
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sty NorKey
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pla
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asl a
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asl a
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asl a
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bcc L6
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bmi L7
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lda (ktab2),y ; Shifted normal key
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ldx GrafMode
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beq L8
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lda (ktab3),y ; Shifted key in graph mode
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bne L8
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L6: lda (ktab4),y ; Key with ctrl pressed
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bne L8
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L7: lda (ktab1),y ; Normal key
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L8: tax
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cpx #$FF ; Valid key?
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beq Done
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cpy LastIndex
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beq Repeat
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ldx #$13
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stx RepeatDelay
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ldx KeyIndex
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cpx #$09
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beq NoKey
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cpy #$59
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bne PutKey
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cpx #$08
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beq NoKey
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sta KeyBuf,x
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inx
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bne PutKey
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NoKey: ldy #$FF
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Done: sty LastIndex
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End: lda #$7F
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ldy #tpiPortA
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sta (tpi2),y
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ldy #tpiPortB
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lda #$FF
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sta (tpi2),y
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rts
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Repeat: dec RepeatDelay
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bpl End
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inc RepeatDelay
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dec RepeatCount
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bpl End
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inc RepeatCount
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ldx KeyIndex
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bne End
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PutKey: sta KeyBuf,x
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inx
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stx KeyIndex
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ldx #$03
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stx RepeatCount
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bne Done
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.endproc
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; Poll the keyboard port until it's stable
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.proc Poll
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ldy #tpiPortC
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L1: lda (tpi2),y
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sta KeySave
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lda (tpi2),y
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cmp KeySave
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bne L1
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rts
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.endproc
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.bss
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KeySave: .res 1
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