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https://github.com/deater/dos33fsprogs.git
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59 lines
1001 B
ArmAsm
59 lines
1001 B
ArmAsm
; shimmery blue pattern
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INDEXL = $F6
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INDEXH = $F7
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HGR2 = $F3D8 ; set hires page2 and clear $4000-$5fff
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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 ; after, A=0, Y=0
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tax ; init X to 0
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stx INDEXL ; set INDEXL to 0
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; pulse loop horizontal
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outer_loop:
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lda #$40 ; reset INDEXH to begin page2
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sta INDEXH
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inner_loop:
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lda even_lookup,X ; get even color
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sta (INDEXL),Y ; store it to memory
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iny
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lda odd_lookup,X ; get odd color
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sta (INDEXL),Y ; store it to memory
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iny
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bne inner_loop ; repeat for 256
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inc INDEXH ; point to next page
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inx ; point to next lookup
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txa ; wrap to 0..7
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and #$7
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tax
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lda #$60 ; see if done
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cmp INDEXH
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bne inner_loop
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; lda #100 ; A is $60 here
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jsr WAIT ; pause a bit
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; A is 0 here
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inx ; offset next FRAME
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jmp outer_loop
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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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