Re: TransWarp GS ROM question

[supertimer@aol.com (Supertimer)]

spec@vax2.concordia.ca (Mitchell Spector) wrote:

>    A have a quick question. Aside from not being able to support
>32K of cache, are there *any* other issues with the ROM firmware
>revision 1.5 used on a TransWarp GS board?

No.

>    I'm about to acquire a ROM chip for my currently non-functional
>TransWarp GS board, incase I decide to repair and upgrade it some-
>time in the near future. The person with the 1.5 ROM claims unlike
>his 1.8 ROM, the board gets unstable above 10 MHz and causes problems 
>with ProTERM 3.1 at 7.8 MHz and above (apparently the 1.8 does not).

This person is absolutely wrong.  I and at least two other csa2
readers have NO such problems with 12.5Mhz TWGS units
possessing 1.5 ROMs.

Most likely, your friend had bad static RAM chips.  He or she
probably upgraded to a 32k cache at the same time as the
1.8 ROM upgrade.  It is not the ROM's fault.

By the way, I seriously suggest that before you give your
2 TWGS units the 9th degree that you try replacing the
CPU chip.  In older TWGS units, the 65C816 were very
flaky because the old design was pushed to the limit.  You
keep saying how your Zip GS is better and all that.  Stop to
think about what is logically the most different...the Zip GS
has a redesigned 65C816.

>    I thought the 1.5 ROM had no issues other than the size of the
>cache, is this true or is there something I'm not aware of?

It is true.  There are no problems.  Ask anyone on csa2 that
has 1.5 ROMs and greater than 10Mhz.