128 lines
1.5 KiB
ArmAsm
128 lines
1.5 KiB
ArmAsm
; staggered pattern -- Apple II Hires
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; D0+ used by HGR routines
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;HGR_COLOR = $E4
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;HGR_PAGE = $E6
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GBASL = $26
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GBASH = $27
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;COUNT = $FE
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FRAME = $FF
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; soft-switches
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; ROM routines
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HGR2 = $F3D8 ; set hires page2 and clear $4000-$5fff
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HGR = $F3E2 ; set hires page1 and clear $2000-$3fff
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HPLOT0 = $F457 ; plot at (Y,X), (A)
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HCOLOR1 = $F6F0 ; set HGR_COLOR to value in X
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COLORTBL = $F6F6
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PLOT = $F800 ; PLOT AT Y,A (A colors output, Y preserved)
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NEXTCOL = $F85F ; COLOR=COLOR+3
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SETCOL = $F864 ; COLOR=A
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SETGR = $FB40 ; set graphics and clear LO-RES screen
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BELL2 = $FBE4
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WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
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staggered:
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; jsr HGR2
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lda GBASL
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sta save1
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lda GBASH
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sta save2
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lda FRAME
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sta save3
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; pulse loop horizontal
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lda #$00
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tay
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tax
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sta GBASL
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sta FRAME
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outer_loop:
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lda #$20
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sta GBASH
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inner_loop:
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lda even_lookup,X
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sta (GBASL),Y
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iny
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lda odd_lookup,X
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sta (GBASL),Y
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iny
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bne inner_loop
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inc GBASH
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inx
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txa
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and #$7
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tax
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lda #$60
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cmp GBASH
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bne inner_loop
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; lda #100
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jsr wait
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inx
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; jmp outer_loop
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inc FRAME
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lda FRAME
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cmp #32
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bne outer_loop
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lda save1
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sta GBASL
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lda save2
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sta GBASH
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lda save3
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sta FRAME
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rts
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wait:
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sec
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wait2:
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pha
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wait3:
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sbc #$01
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bne wait3
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pla
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sbc #$01
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bne wait2
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rts
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even_lookup:
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.byte $D7,$DD,$F5,$D5, $D5,$D5,$D5,$D5
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odd_lookup:
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.byte $AA,$AA,$AA,$AB, $AB,$AE,$BA,$EA
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save1: .byte $00
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save2: .byte $00
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save3: .byte $00
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