>I've almost got it all together (my math mistake was mistaking one
>scanline for one machine cycle). Just one more question about the PIA
>timer, and I think I'll have it down. It says one PIA cycle occurs for
>each machine cycle. A couple of pages later, though, it says "NOTE:
>one clock is also one microprocessor machine cycle." I thought there
>were three clocks for each machine cycle. Or is the clock it is
>referring to the PIA clock instead?
One clock cycle for the timer is the same as one clock cycle for the
microprocessor, which is the same as three color clocks; a color clock is
one pixel.
3 pixels = 3 color clocks = 1 CPU cycle = 1 machine cycle = 1 timer cycle.
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