Re: TransWarp IIgs GAL's - Upgrade now possible

["roughana" <andrew.roughan@writeme.com>]

Mark Frischknecht wrote:
> Henry wrote:
> > I have
> > successfully been able to make copies of the last revised set of GAL's
> > released by AE.  The GAL numbers and versions are as follows: 1A, 2B, 3E,
> > 4B, 5A, 6A, 7A, 8B.
...
> > The 3E GAL is for above 10 MHz operation.
> >

> My TWGS is Running at 12.5 Mhz with a 3c gal and the rest rev a gal's.
> Of course I use cooling (Kennigston System Saver with Upgraded Fan) and
> w65816s8pl-14 cpu with a 32kb cache and 1.8s rom (Which I believe is the
> lastest).

Henry, and others contemplating purchasing different GALs, please note
the following entry in the Apple II Csa2 FAQs: Accelerators, Part 3/25

===========
020- Do I need new GALs to speed up my TransWarpGS?

Probably not. The new 14MHz 65C816's available from WDC make it
generally unnecessary to swap in new GAL chips to go to higher speeds.
In fact, one user with the faster GALs already installed reports that
his TransWarpGS would not work until GAL 3E was replaced with an older
GAL 3A.

If you are attempting to use an older 65C816-- e.g. a 10MHz chip
released in the early 1990's-- then, it may be necessary to upgrade the
GALs (especially GAL 3A) to run reliably above 10MHz. Due to variations
in boards and parts, about the only way to find out is to experiment.
=========

I am the user who made that report. I extensively tested early and late
versions of GALs with the Sanyo 14MHz 65C816's available from WDC,
swapping in one part at a time.
In my experience, GAL 3E would not work with the Sanyo 14MHz 65C816's
available from WDC.

Of course, your mileage may vary, but personally I think replacing a
GAL without a valid reason to do so is probably unnecessary.

>From my 2003 post (http://tinyurl.com/8pcht):
-----
My TWGS has 32k cache (35ns SRAMs), ROM 1.8s
GALs 1A, 2B, 3B, 4B, 5A, 6A, 7A, 8A
Running ok at 14Mhz with 56Mhz oscillator.
-----
Unfortunately, I didn't say which 65816 I was using, however I'm pretty
sure that was with the Sanyo 14MHz 65C816.

Cheers,
Andrew