4cade/src/fx/fx.hgr.cascade.a

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;license:MIT
;(c) 2019 by qkumba
!cpu 6502
!to "build/FX/CASCADE",plain
*=$6000
!source "src/constants.a"
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ldx #191
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--- jsr WaitForVBL
lda #$40
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sta $e6
lsr
sta $29
jsr vposn
lsr $e6
ldy #$27
- lda ($26), y
sta $2000, y
dey
bpl -
stx maxline + 1
ldx #0
stx $28
beq + ;always
-- lda $26
sta $28
lda $27
sta $29
+ inx
jsr vposn
ldy #$27
- lda ($28), y
sta ($26), y
dey
bpl -
maxline
cpx #$d1 ;SMC
bne --
ldy #5
-- tya
pha
dex
jsr vposn
lda $26
sta $28
lda $27
eor #$60
sta $29
ldy #$27
- lda ($28), y
sta ($26), y
dey
bpl -
pla
tay
dey
bne --
txa
beq done
dex
lda $c000
bpl ---
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done jmp UnwaitForVBL
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vposn txa
pha
and #$c0
sta $26
lsr
lsr
ora $26
sta $26
pla
sta $27
asl
asl
asl
rol $27
asl
rol $27
asl
ror $26
lda $27
and #$1f
ora $e6
sta $27
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rts