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?
Description
This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
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?
You may be able to get it to run at up to 10MHz by just replacing the
oscillator with a faster one for less than two dollars!
I have a Zip GS that came as a 7/32 and was used at 7MHz for a long time.
The board came with a socketed oscillator, so one day I swapped out the 28MHz
oscillator for a 36MHz one. The computer booted up at 9MHz. When the 36MHz osc
was replaced with a 40MHz osc, the Zip ran at an amazing 10MHz!
Your mileage may vary, though. The GS that this upgraded Zip resides in
has a high output power supply. Still, considering these oscillators cost $1.39
each, it is worth getting three or four and trying an oscillator swap alone
first. If a faster oscillator alone won't do the trick, then a faster CPU and/
or faster cache chips may be necessary.
Good Luck!
By: Frank M. Lin
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