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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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• prev: 03.013 I have a 7MHz ZipGS. How fast can the board be pushed without getting new SRAMs or a new CPU? What parts do I need?
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• next: 03.015 How do I experiment with different oscillator frequencies?

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