C64 Coding: stabilizing raster with cia timer reference /Copyfault

Quoting Copyfault

Quoting Krill

Quoting TWW

Appreciate the intellectual exercise, but I admit I am curious in which particular use case is using a separate (free of charge) timer for sync. purposes isn't an option vs. the arithmetic exercise to derive it from a v-sync timer?

Yeah, seems awfully contrived. =)

Well, this was the reason I "rewrote" the OP, or what I thought was asked for. And if all other timers and IRQ-source are in use already (could be), then reusing a timer *can* be a thing you need in reality...

Fair enough and by all means, was just curious in what use case this would apply.

I mean if you have 1 timer set to 60 Hz (which is normally reasonable if you want consistant speed across systems) there is nothing stopping you to implement a counter inside this handler which wraps at 6 which the in turn gives you a "new timer" at 10 Hz if you so desire with very little cost. Hence the use case question as there is usually an easier way :)