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cc65/libsrc/atari5200/waitvsync.s

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;
; Written by Christian Groessler <chris@groessler.org>
;
; void waitvsync (void);
;
.include "atari5200.inc"
.export _waitvsync
.proc _waitvsync
lda RTCLOK+1
@lp: cmp RTCLOK+1
beq @lp
rts
.endproc