Re: New chip in TWGS

[mystix@direct.ca (Herbert Fung)]

In <7rf34r$iee$1@holly.prod.itd.earthlink.net>, "Trevor J. Mahan" <tjmahanNOSPAM@earthlink.net> writes:

>Well, I replaced the old TWGS 65C816 with the newer 65C816S8PL-14 and fired
>her up.  There is a noticeable speed difference, especially with loading
>System 6.0.  I need some help though with configuring it.  Rubywand or

You'll also notice that the TWGS startup sound/graphics sequence is
accellerated as well.

>anyone with knowledge about these--How do I check what speed I'm truly
>running at?  Also, after setting control panel to fast and Transwarp speed,
>is there anything else to do with setting multipliers?  Is it like a PC MB,

There isn't any setting other than Normal (1MHz), Fast (2.8MHz), and
TransWarp (7Mhz+) The TWGS speed is dependant on how fast your
oscillator is. The oscillator has to be 4X faster than the speed you want
to run at. So a 64MHz oscillator will give you 16MHz, which is the fastest
I've heard someone push a TWGS.

The CPU itself can probably be pushed to 20MHz but according to others
you'll probably need faster than 15ns SRAMs. The fastest reliable speed
for stock TWGS's I think was 12.5MHz.

>do I need to set any jumpers on the Card itself?  Any help would be very
>appreciated.  Thanks:)

There was a TWGS NDA that would give you a readout of the current speed.
The TWGS doesn't support user selectable speeds in any control panel or
software. I speculate that in theory if someone were to modify the TWGS ROM
it might be possible. The only person I heard of who was writing a ROM for the
TWGS was Tony Diaz for his TWGS 64k cache prototype board.

--
Herbert Fung
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