Re: FAQ-Zip GS upgrade: The 10MHz alternative

[ballwebr@holmes.ece.orst.edu (Brian Ballweber)]

Richard Der (rder@pro-palmtree.cts.com) wrote:
: 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
: the 28MHz oscillator with 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!

The speed rating of your processor should be printed on it as a -xx 
following the part number, like this:

W65C816-10 (or similar, -10 for 10Mhz, -7 for 7Mhz, etc...)

This is supposed to be the speed it was intended to run at, however
it is possible to overclock it and still have it work.  Results may vary,
but you shouldn't need an array of crystal oscs. to find a workable one.

My Zip was originally a 9/32, but I noticed it had a 10Mhz '816 so
it was trivial to swap the oscs and get a 10/32.  Incidentally some
standard freq oscs are used a lot for clocking PC motherboards
(40Mhz, 50Mhz) so you can typically find them at any local computer
store.

- Brian