Re: Arrgh! Wrong TransWarp GAL's

[fmlin@netcom.com (Frank M. Lin)]

In article <1994Sep6.005259.16887@pro-nsdapple.cts.com>,
Gary Evans <gary@pro-nsdapple.cts.com> wrote:
>Now that the new 65816's are shipping, I figured that it might be a good
>time to give the 'ol IIgs a speed boost.  After reading the FAQ, I popped
>the lid off the gs to check the GAL versons on my transwarp.
>
>ACK!!!
> the FAQ says I need   2B  (DMA fix)
>                       3E  (+10 mhz)
>                       4B  (?)
>                       8B  (?)
>Fortunately I already have the 2B, 4B & 8B GAL's
>HOWEVER I only have the _3D_ GAL.  

This is from the sheets that WDC used to require you to get first before
you can buy an engineering chip...  "In addition, currerent 65C816 chips
cannot execute certain instructions reliably when operating beyond 4 
MHz; circuitry on the TWGS intercepts those calls and allows extra time
for their exectution.  However, when you reach 10 MHz, additional 
instructions do not excute reliably in 16 bit mode.  The TWGS does not
intercept these instructions unless you use a revision E or later TWGS 
3 GAL."

So, perhaps with the new chip fab techniques, these problems were cured.
So a 3D GAL might actually let you go slightly faster than 3E.  :-)

>Seeing as AE is now out of businees, where do I get on of these things?
>What happens if I plug in a 14mhz chip with the 3E chip?
>
>Also, how do I tell how much cache RAM is on the card.  I know they could
>be had with an optional 32k cache, but the faq makes no mention of how to
>tell.

Couple of ways, from the TWGS CDA menu:

     TransWarp GS version 8/32S
            Revision 1.8S
       Copyright (c) 1989-1991
        Applied  Engineering

Or look at the little piggy back board, if you can see the 4 chips on
it, then you have the old 8 KB cache.  If you can't see them, it's
the 32 KB cache.

-- 
Frank M. Lin
fmlin@netcom.com