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Forums > C64 Coding > Cycles to get into IRQ routine
2015-05-20 04:17
Hypnosis

Registered: Mar 2015
Posts: 36
Cycles to get into IRQ routine

How many cycles does it take from an IRQ trigger to the start of the IRQ routine, assuming the CPU finished the instruction when it triggers? It should be around 6-9 cycles but I'm not sure how many.
 
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2016-03-22 08:53
JackAsser

Registered: Jun 2002
Posts: 2014
Quote: And how can a demo effect profit from all this knowledge? :-D

They already did... First time I did it was in the vector balls on top of 4x4 fli tunnel in The Wild Bunch f.e.
2016-03-22 08:54
Flavioweb

Registered: Nov 2011
Posts: 463
Opening sideborder using stable cia based irq... just stop working if running on -wrong- cia...
2016-03-22 10:38
Hypnosis

Registered: Mar 2015
Posts: 36
In my case it is 8-bit sample playback. I'm doing the memory saving option first with dynamic cycle delay in code.
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