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Fix Alternate Display Mode on ROM0 and ROM1 //gs (#530)

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fixes attract hanging on ROM0 and ROM1 machines
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frankmilliron 2022-11-27 08:46:44 -08:00 committed by GitHub
parent 1b49c67062
commit 327d37bedd
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1 changed files with 10 additions and 5 deletions
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15
src/macros.a
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@ -371,14 +371,19 @@
sec
jsr $FE1F ; check for IIgs
bcs ++
lda #$20 ; check if Alternate Display Mode is already on
sta $0800
tya ; GS ID routine returns with ROM version in Y
cmp #0 ; ROM 0?
beq ++
cmp #1 ; ROM 1?
beq ++
lda #$20
sta $0800 ; check if Alternate Display Mode is already on
lda #$FF
jsr ROM_WAIT
jsr ROM_WAIT ; skip a VBL cycle
!cpu 65816
lda $E00800 ; did we shadow copy data to shadow bank $E0?
lda $E00800 ; did we shadow copy data to bank $E0?
cmp #$20
beq +
beq + ; only call TEXT2COPY if we know it's off
!cpu 6502 ; https://archive.org/details/develop-04_9010_October_1990/page/n51/mode/1up
jsr ROM_TEXT2COPY ; set alternate display mode on IIgs (required for some games)
+ cli ; enable VBL interrupts