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cc65/libsrc/nes/clock.s

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;
; Written by Groepaz/Hitmen <groepaz@gmx.net>
; Cleanup by Ullrich von Bassewitz <uz@cc65.org>
;
; clock_t clock (void);
;
.include "nes.inc"
.export _clock
.importzp sreg
.proc _clock
ldy #0 ; High word is always zero
sty sreg+1
sty sreg
ldx tickcount+1 ; ## Problem: Cannot disable ints here
lda tickcount
rts
.endproc