2015-11-26 15:06:20 -05:00
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.interruptor ticktock
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2015-09-19 15:55:43 +02:00
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.include "extzp.inc"
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ticktock:
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2015-10-02 13:28:17 -04:00
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bbr5 vdc_flags,@s1 ; skip if not vertical-blank interrupt
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2015-09-19 15:55:43 +02:00
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; Increment the system tick counter.
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inc tickcount
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bne @s1
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inc tickcount+1
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bne @s1
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inc tickcount+2
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bne @s1
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inc tickcount+3
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@s1: rts
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