> That makes sense. And it goes with everything else I've read. Now, I did cheat and
> looked at the Mame Source for centipede (naughty naughty me!) It lists the XTL as
> 12.096. When you divide that by 8 for the 6502 you end up with 1.512. Also, there is
> a note that it should be 0.756 when accessing the playfield RAM.
>
> On the Zarzon schematic the clock isn't clearly marked to say "Hey silly...here's
> your XTL.", but it does clearly show 11.289 which, if I were to cross-reference this
> with xtl.h would lead me to believe I was looking at the correct thing. I didn't see
> anything resembling 12.096 on the Centipede schematic. (Did I just miss it?) Is it
> possible to get this number from the schematic if the number isn't clearly written?
> Or is the only way to get it (other then finding it documented somewhere else) to
> measure it directly from the PCB?
>
> ArcadeGamenut
A cursory look at the schematic I found online shows the following:
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