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TransWarpGS boards vary just as do ZipGS boards. Some can be pushed to

higher speeds than others. If you decide to do a speed upgrade, get two or three

oscillators to allow for some experimentation.

For a step-by-step guide, download Scott G's TWGSupgrade.SHK. HyperCard

stack. (See Q&A 019 above)

______________________________

From: Wayne Stewart

I have a TransWarpGS with rev A GALs and a rev 1.5 ROM. It came as 7mhz

with an 8k cache. It was pretty unstable when I recieved it, so I put in a spare

14mhz 65c816 I had which stabilized it. Since I had a lot of rectangular

oscillators from my ZipGS upgrade experimenting, I made up an adapter so I could

use them in the TransWarp. With those two changes it's running at 14mhz.

______________________________

From: Andrew Roughan

It's time (June 2003) for an update on this article. I have recently

purchased some more oscillators from Clarke & Severn Electronics. They can now

provide custom programmed oscillators in 1/2 TTL packages for AU$6.98 each.

I am currently running my ROM 3 system at 14Mhz. I have a Transwarp GS with

ROM 1.8S and the 32k cache from Applied Engineering (35ns SRAMs). The GAL

versions are TWGS1A1, TWGS2B1, TWGS3B1, TWGS4B1, TWGS5A1, TWGS6A1, TWGS7A1,

TWGS8A1. I have the 14Mhz 65816 available from WDC. I have not purchased faster

SRAMs or modified the power supply.

______________________________

From: Rubywand

024- What kind of RAMs do I need for a TWGS or ZipGS

speedup?

If you upgrade your accelerator RAM, go for fast 32k x 8 Static RAM in a

28-pin Dip package. If your RAM sockets are "skinny" (about as fat as a typical

74xx TTL IC), you want a 300-mil wide package. Otherwise, you will need a 600-

mil wide IC or a socket adapter for 300-mil (or do the socket mods described

earlier in this FAQ).

Fast 600-mil package 32k x 8 SRAMs are fairly rare. However, the IDT71256

is supposed to be available at good speeds (25ns-40ns) in a 600-mil version from

Integrated Device Technology.

The selection of 300-mil 32k x 8 SRAMs is much larger: Cypress's CY7C199,

Hitachi's HM62256, ... .

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