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cc65/libsrc/cbm510/waitvblank.s

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.export _waitvblank
.import PALFLAG
.import sys_bank, restore_bank
.importzp vic
.include "cbm510.inc"
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_waitvblank:
rts ; FIXME
jsr sys_bank ; Switch to the system bank
sei
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ldy #VIC_CTRL1
@l1:
lda (vic),y
bpl @l1
@l2:
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lda (vic),y
bmi @l2
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cli
jmp restore_bank