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cc65/libsrc/c128/waitvblank.s

26 lines
380 B
ArmAsm

.export _waitvblank
.include "c128.inc"
_waitvblank:
lda MODE
bmi @c80
@l1:
bit VIC_CTRL1
bpl @l1
@l2:
bit VIC_CTRL1
bmi @l2
rts
@c80:
;FIXME: do we have to switch banks?
@l3:
lda VDC_INDEX
and #$20
beq @l3
rts