Re: TWGS

[supertimer@aol.com (Supertimer)]

CBS <jsmith66@hotmail.com> wrote:

>I've read here that the GAL's are hard to copy.  Why is this?  Besides
>the obvious reason of copyright (held by a now bankrupt, long gone
>company), what is stopping Apple II'ers from copying the fastest GAL
>chips?

Or upgrading the ROM!  The ROM contains the programming
for the cache size.  Unlike the ZipGS, which all logic is locked
into a soldered ASIC, the TWGS is designed to be a more
open system.

The original ROM supported 8k of cache.  Later ones
supported 32k.  64k and beyond is possible with higher density
cache RAM chips and new ROM programming.