Re: Big-PET

From: Martijn van Buul (
Date: 1998-09-07 10:15:21

Ruud Baltissen wrote:
> > > One genearl question remains: What happens if the processor of a PET or
> > > 1541 runs out of phase with the onboard clock or even at a (slightly)
> > > different speed? In case of the PET I think of the video and in case of the
> > > 1541 I think of the I/O for reading from/writing to the disk.
> > 
> > I'm not sure what happens with a PET, but I just happened to read an 
> > article last night about an upgrade for the old SpeedDos system for the
> > 1541/C64. Basicly, all it did was doing the GCR decoding in hardware
> > instead of software, and speedup the processor to 2MHz while doing
> > disk I/O. I'll lookup the article for you (but since I won't have
> > any internet connection for the next week or so, that'll take a while :)
> > 
> > I believe it was called something like "Professional DOS pro"
> Nog gevonden?
Yeah, but it didn't provide more information than the above, basicly. There
was a small picture next to it (a small daughterboard for the processor
with some glue logic and the extra crystal, if memory serves me right).
I might send you a copy of it, if you're still interested
Fight Spam! Join CAUCE! ==
Martijn van Buul,
Tijntje@OuterSpace - 3333 
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