Re: Speeding up aTransWarp IIGS

["Mark Cummings" <NOTfigjams@primus.com.au>]

that's pretty much all you need (14MHz CPU & xtal), but no guarantees it
will run reliably. These upgrades are a bit of a hit and miss affair.
Personally I wouldn't bother with the 64MHz xtal, as there are very few
TWGSs that'll run for longer than 10 seconds at 16MHz. I'd recommend a 40MHz
xtal as well, to run at 10MHz in case you have reliability problems at
12.5MHz. I assume you have the 32K cache board from Germany, with the 3x 32K
Static RAMs fitted. The instructions that came with that board will tell you
the mods to the TWGS board as a couple of pads have to be cut. If your 32K
cache board was fitted when you bought it, those mods should already be
done.

Another thing to check is that your board has a socket for the clock-osc as
I think some were soldered directly to the board. If you need to add a
socket, get an 8-pin machine pin type socket.

Mark


"Giorgio Ungarelli" <giorgio@ungarelli.net> wrote in message
92e20da.0204270713.2fea73dc@posting.google.com">news:92e20da.0204270713.2fea73dc@posting.google.com...
> Hi,
>
> I have a TransWarp IIGS with the 32K cache.  Its ROM is V1.8S and it
> is running at the standard 7MHz speed (at least that is what one CPU
> test program is giving me under ProDOS).  I have read that it is
> possible to speed this card up even further.
>
> Am I right in assuming that the only two items I need to purchase and
> replace on this TransWarp IIGS card are:
>
> ECS HALF SIZE CRYSTAL CLOCK OSCILLATOR dip-8 5v 64.0 mhz
> ECS-2100A-64.0MHZ from http://www.mouser.com
>
> and
>
> W65C816S8PL-14 CPU from http://www.westerndesigncenter.com
>
> With the two changes above, I should end up with a 16MHz TransWarp
> IIGS, right?
>
> If I purchase the 50MHz half size oscillator instead of the 64MHz
> oscillator (just to be on the safe side), then the TransWarp card
> should run at 12.5 MHz.
>
> If I am missing some information (or even if the above is correct),
> could somebody please confirm?
>
>
> Thanks,
>
> Giorgio