Re: Zip GSX Mod to 12.5Mhz (or better)

[scott@alfter.DIESPAMMERSDIE.us (Scott Alfter)]

In article <C31BF953.4D3D%bjjlyates@bellsouth.net>,
winston19842005  <bjjlyates@bellsouth.net> wrote:
>On 9/23/07 9:33 AM, in article 46f66b15@news.comindico.com.au, "Polymorph"
><mike.a.stephens@gmail.com> wrote:
>> As promised in another thread, I have posted details of how I modded my
>> Zip GSX to run at 12.5Mhz. It includes the complete parts list, and
>> pictures of how to perform the modification to your board (if you are game).
>> 
>> Check it out, and let me know what you think:
>> 
>> http://apple2.sytes.net/ZIP_GSX_Mod/index.html
>
>Wow, that looks easy! How hard is it to get the parts? Couldn't find some
>0.6" SRAMS for the TAG sockets?

I used 12-ns SRAM for both tag RAM and cache on mine, so it has the narrow
chips all across.  Then again, I think I paid nowhere near $12 per chip for
it...JDR isn't exactly the cheapest place to buy this stuff.

I've had trouble in the past getting it to run reliably beyond 8 MHz,
though, even with a 14-MHz processor and with whatever 74Fxx parts are
supposed to be replaced with 74ACTxx.  With the upgraded power supply that's
in there now, I might give it another shot...just need 40- and 50-MHz
oscillators to give 10 and 12.5 MHz operation another shot.

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