mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-05-29 08:41:36 +00:00
58 lines
649 B
ArmAsm
58 lines
649 B
ArmAsm
GBASL = $26
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GBASH = $27
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HGRPAGE = $E6
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XX = $FE
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YY = $FF
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PAGE0 = $C054
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PAGE1 = $C055
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HGR = $F3E2
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HGR2 = $F3D8
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HCLR = $F3F2
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HPOSN = $F411 ;; (Y,X) = X, A = Y
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;; line addr in GBASL/GBASH
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;; with offset in HGR.HORIZ, Y
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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sprite:
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jsr HGR ; clear page0
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jsr HGR2 ; clear page1
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; HGR page now $40
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lda #50
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sta XX
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sta YY
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move_sprite:
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draw_sprite:
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ldy #0
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ldx XX
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lda YY
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jsr HPOSN
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; ldy #0
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lda (GBASL),Y
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eor #$7f
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sta (GBASL),Y
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iny
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lda (GBASL),Y
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eor #$7f
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sta (GBASL),Y
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inc XX
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inc YY
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lda YY
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cmp #190
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bcc no_oflo
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lda #0
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sta YY
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no_oflo:
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jmp move_sprite
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