Re: TWGS

[CBS <jsmith66@hotmail.com>]

COoler, yes.

Very much cooler.  I used to be able to feel heat from 3 inches away with my
hand.  Now I can barely feel warmth by touching the Transwarp card's
components

Supertimer wrote:

> Liam Busey <liam1@ix.netcom.com> wrote:
>
> >CBS wrote:
> >>
> >> (FOLLOWING IS THEORY, based on the facts I've collected)
> >> ***************************************************************
> >> the REV A Gals were made when the FIRST 65816 chip came out.  This
> >> would mean no bugs that you'd have to slow it down for, thus the A
> >> gals. Then they sped up the CPU, but not flawlessly, so they had to
> >> slow down certain instructions in order for them not to crash the
> >> CPU/TWGS card. That required the addition of the B (and other???) gals
> >> ***************************************************************
> >
> >I don't believe the original 65816 was ever sped up. I think WDC just
> >had certain batches that were more reliable at higher speeds than
> >others. Kind of like CRT quality in monitors.
>
> That was the case with the older 65816 chips.  I think CBS meant
> that AE and Zip Technologies overclocked the original 65816
> to make accelerators.  But they could not do this without breaking
> the chip at certain instructions.  That's why they needed "slow
> down" bug traps (the "B" GALs in TWGS and the slow down
> logic in the ASIC of the ZipGS).  When the redesigned by
> Sanyo WDC 65C816 units came out, the "buggy at high speed"
> instructions became reliable at high speeds, so the "B" GALs
> were no longer needed (except for 2B if you have a RamFAST,
> it seems).
>
> Incidentally, does anyone notice that the TWGS runs A LOT
> cooler with the 14Mhz redesigned 65C816 units than the
> original "buggy" 65C816?