RE: 2Mhz Geos64??

From: COPLIN, Nicholas. (
Date: 1999-11-10 06:55:28

thanks for forwarding....

Does Geos128 run at 2Mhz when in 40col screen mode or only in 80col?

> -----Original Message-----
> From:	Todd S Elliott []
> Sent:	Wednesday, 10 November 1999 13:15
> To:
> Cc:
> Subject:	Re: 2Mhz Geos64??
> On Wed, 10 Nov 1999 13:03:59 +0800 "COPLIN, Nicholas."
> <> writes:
> > I've used patches to get the 2Mhz mode happening in the borders in 
> > C64 mode
> > (on a C128) whist in basic. Does anybody know of a patch for Geos64 
> > which
> > does the same thing? (I'm after a poor-man's CPU accelerator!).
> > 
> Heh.
> Yes, there is a patch that allows GEOS to run in 2MHz. It is called,
> strangely enough, GEOS 128. :) Ok, I get the gist of what you're after...
> > If not, does anyone know enough about the GEOS kernal to know where 
> > this
> > sort of routine would be patched in.  Should be easy as Geos 
> > background
> > ticking is controlled through the raster interrupt in any case. 
> > right?!?
> > 
> It's possible. AFAIK, GEOS does use the raster beam to coordinate its
> interrupt activities. This kind of thing requires patching in its Kernal.
> I forwarded this message to Maurice Randall, and maybe he can be of
> assistance.
> -Todd Elliott
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