mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-27 02:31:00 +00:00
50 lines
674 B
ArmAsm
50 lines
674 B
ArmAsm
GBASL = $26
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GBASH = $27
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HGRPAGE = $E6
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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
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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stars:
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jsr HGR
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jsr HGR2
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; lda #0
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; sta ybase
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lda #$20
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sta HGRPAGE
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move_stars:
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lda HGRPAGE
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cmp #$20
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beq show_page1
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show_page2:
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bit PAGE1
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lsr HGRPAGE
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bne doit
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show_page1:
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bit PAGE0
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asl HGRPAGE
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doit:
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jsr HCLR
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; FORI=1TO10
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; A=X(I)
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; B=Y(I)
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; C=Z(I)*.1
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; X(I)=A+(A-140)*C
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; Y(I)=B+(B-96)*C
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; Z(I)=Z(I)+.1
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; IFX(I)<0ORX(I)>279ORY(I)<0ORY(I)>191THENX(I)=RND(1)*280:Y(I)=RND(1)*192:Z(I)=0:GOTO7
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;HPLOTA,BTOX(I),Y(I)
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;NEXTI
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jmp move_stars
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