03.014 What Oscillator freq corresponds to what TWGS/ZipGS operating speed?
Description
This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
03.014 What Oscillator freq corresponds to what TWGS/ZipGS operating speed?
For TWGS and ZipGS, the crystal oscillators runs at 4 times the speed of
the 65816. Below is a chart showing osc and corresponding TWGS or ZipGS speed.
Osc Frequency MHz TWGS/ZipGS Speed MHz
28 7
32 8
33.3333 8.3333
36 9
40 10
42 10.5
46 11.5
48 12
50 12.5
55 13.75
60 15
My understanding is that, if you over-clock a CPU. It just won't function.
You can't damage it. As the disclaimer said, do it at your own risk. I have
tried to run my TWGS at 20 MHz, system won't boot at all. No damage.
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