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Partial revert of VRAM adjustment

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codemann8
2021-06-24 14:35:31 -05:00
parent 92c3448ac2
commit 7ba76d4a5c
1 changed files with 10 additions and 8 deletions
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18
owrando.asm
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@@ -231,14 +231,16 @@ OWNewDestination:
inc : pha : lda $06 : and #$fe00 : !add 1,s : sta $06 : pla
; adjust and set other VRAM addresses
lda.w $0006,x : pha : lda $06 : !sub 1,s
jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : pha ; number of tiles
lda $418 : dec #2 : bmi +
pla : pea $0000 : bra ++ ;pla : asl #7 : pha : bra ++ ; y-axis shifts VRAM by increments of 0x80 (disabled for now)
+ pla : asl : pha ; x-axis shifts VRAM by increments of 0x02
++ lda $84 : !add 1,s : sta $84 : pla : pla
LDA $84 : SEC : SBC #$0400 : AND #$0F00 : ASL : XBA : STA $88
LDA $84 : SEC : SBC #$0010 : AND #$003E : LSR : STA $86
lda OWMode : and #$00ff : bne .modifyOtherVram
lda.w $0006,x : pha : lda $06 : !sub 1,s
jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : pha ; number of tiles
lda $418 : dec #2 : bmi +
pla : pea $0000 : bra ++ ;pla : asl #7 : pha : bra ++ ; y-axis shifts VRAM by increments of 0x80 (disabled for now)
+ pla : asl : pha ; x-axis shifts VRAM by increments of 0x02
++ lda $84 : !add 1,s : sta $84 : pla : pla
.modifyOtherVram
LDA $84 : SEC : SBC #$0400 : AND #$0F00 : ASL : XBA : STA $88
LDA $84 : SEC : SBC #$0010 : AND #$003E : LSR : STA $86
.adjustMainAxis
pla : pla : sep #$10 : ldy $418