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dont trash akku if possible, use VDC register when in 80column mode

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This commit is contained in:
mrdudz 2017-06-21 23:18:00 +02:00
parent 035621aa95
commit 49aad01bf1
2 changed files with 16 additions and 4 deletions
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16
libsrc/c128/waitvblank.s
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@ -4,10 +4,22 @@
.include "c128.inc" .include "c128.inc"
_waitvblank: _waitvblank:
lda MODE
bmi @c80
@l1: @l1:
lda VIC_CTRL1 bit VIC_CTRL1
bpl @l1 bpl @l1
@l2: @l2:
lda VIC_CTRL1 bit VIC_CTRL1
bmi @l2 bmi @l2
rts rts
@c80:
;FIXME: do we have to switch banks?
@l3:
lda VDC_INDEX
and #$20
beq @l3
rts

4
libsrc/c64/waitvblank.s
View File

@ -5,9 +5,9 @@
_waitvblank: _waitvblank:
@l1: @l1:
lda VIC_CTRL1 bit VIC_CTRL1
bpl @l1 bpl @l1
@l2: @l2:
lda VIC_CTRL1 bit VIC_CTRL1
bmi @l2 bmi @l2
rts rts