Re: Overclocking Accellerator and other Transwarp questions

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

>Hey there.  I got a handful of 65816-14 processors and today I got some
>crystals (a 40, a 48, and a 64) with the intent of enhancing my Transwarp
>(1.5 ROM revision).
>I popped in a processor and the 48, and things boot up nicely.  The 64 (a
>bit high, I know) just comes up with a sound initialization error, so I
know
>that's too extreme.  I'd like some crystals in the 50-60MHz range, but
>haven't found them.
>Anyway, so I've currently got it at 12MHz, and things seem to work.  Booted
>up my hardrive, ran a couple apps, etc.  How do I stress test it to see how
>it performs?  I've got it running Modulae currently.

You mean you can run it at 12MHz without upgrading the cache chips, or have
you already done that. When I tried the same thing with just upgrading the
CPU, I couldn't get it to run over the standard 7MHz.

>Other questions -
>1:  The blinking green light.. what exactly does it represent?  Cache hits?
>I notice that it blinks at different rates, going out altogether when its
>busy doing disk I/O.

This indicates the TWGS is running at fast speed (TWGS speed). When it's off
it will be running at the slower 1MHz speed to maintain hardware
compatability. A GS without a TWGS running at ~2.6MHz also does this during
I/O.

>2:  What is the connector on the transwarp board for?  Direct connection to
>a memory card?  Undeveloped interface or something?
>3:  Anyone want a half sized 64MHz oscillator?

No thanks, got one also and will never be able to use it. I got a 50MHz
crystal from Mouser Electronics, but this will only give you a tiny increase
over 12MHz. I guess you need a 56K XTAL, and I have yet to find one myself.
Another possibility is to modify the circuit so that you can use a 28MHz
XTAL and divide by 2 instead of 4. I don't have the details of how to do
that, but I've heard of it being done.

Mark