Cameron Kaiser wrote:
>
> >>Does Geos128 run at 2Mhz when in 40col screen mode or only in 80col?
> >
> >Screen mode doesn't matter. Anything runnning on the C128, in C128 mode,
> >is running at 2Mhz.
>
> No, no. The VIC-IIe can't do 2MHz and keep the 40-column screen updated.
> Unless the screen is blanked, if you're in 40-columns, you're at 1MHz (even
> in 128 mode). Only the VDC can continue to do screen updates at 2MHz.
>
But with the application of raster interrupts you could achieve a speed
increase if you can get the processor to do 2 mghz when the video scan is not
on the visible screen. I recall an article stating it would be about a 25%
increase... I recall there is a 128 version of Mah Jongg that employs this technique...
--
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Larry Anderson - Sysop of Silicon Realms BBS (209) 754-1363 300-2400 baud
Commodore 8-bit page at: http://www.jps.net/foxnhare/commodore.html
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