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cc65/libsrc/pce/waitvblank.s

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;
; void waitvblank (void);
;
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.include "pce.inc"
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.include "extzp.inc"
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.forceimport ticktock
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.export _waitvblank
.proc _waitvblank
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lda tickcount
@lp: cmp tickcount
beq @lp
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rts
.endproc