Re: not sure on //c+ stuff but can you do this? 8mhz //cplus mod?

["Michael J. Mahon" <mjmahon@aol.com>]

Wayne Stewart wrote:
> brad wrote:
>
> > saw this //c plus for sale on ebay...he posted a pic of making it an 8mhz
> > mod using the 14mhz wdc chip and a crystal change
> >
> > here is the link?
> >
> > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5823223830&fromMakeTrack=true 
> >
> >
> > i don't know the machine and i don't plan on bidding on this but does 
> > this
> > thing work? as a hack?
> >
> > anyway have fun if you are interested..i actually have one of these 
> > beasts
> > someplace...i never use it but....at least i might know how to make it
> > faster
> >
> > brad
>
>
> A couple of us sped up the IIc+ 2 or 3 years ago. The other guy got
> 8mhz and I toped out at 10mhz. We didn't do all that hacking, all we
> did was replace the oscillator with a faster one. With a bit of
> experimenting, I likely could have gone faster but I didn't feel the
> need. If I'd had s faster data input than a floppy drive, I might have
> felt more inclined to try for more speed.

I think it's significant that you didn't need to replace the
processor to obtain the higher speed.

And the mod shown in the auction appears to have increased the
cache size, as well, with the hard part being the conversion
from 600-mil SRAMs to 300-mil SRAMs.

-michael

Music synthesis for 8-bit Apple II's!
Home page:  http://members.aol.com/MJMahon/

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