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cc65/libsrc/pce/ticktock.s
2015-09-19 15:55:43 +02:00

19 lines
411 B
ArmAsm

.interruptor ticktock, 24
.include "pce.inc"
.include "extzp.inc"
ticktock:
bbr5 vdc_flags,@s1 ; not vertical-blank interrupt
; Increment the system tick counter.
inc tickcount
bne @s1
inc tickcount+1
bne @s1
inc tickcount+2
bne @s1
inc tickcount+3
@s1: rts