Mac 512k

From: Brian Wheeler <bdwheele_at_indiana.edu>
Date: Fri Feb 1 10:16:40 2002

On Fri, 2002-02-01 at 11:17, Christopher Smith wrote:
> > -----Original Message-----
> > From: Ben Franchuk [mailto:bfranchuk_at_jetnet.ab.ca]
>
> > > Remember that it takes a relatively old OS to boot a 512k mac.
> > I still remember reading how to upgrade your mac to 512k from
> > 128k. The
> > old solder on new chips over the old ones trick.
>
> I recall the same kind of trick for a color-computer 1. :) In
> that case, it was supposed to give you extra capacity above the
> supposed 64k maximum. No idea how it was addressed. It could
> be that my memory is cloudy and it was an upgrade _to_ the 64k
> maximum.
>

Partly cloudy. My dad did the 32K->64K upgrade on the coco1, and it
required the 2nd bank of 32K to be soldered on top of the 1st bank :)
With some motherboard trace cuts thrown in for good measure.

> I seem to remember, for some reason, the upgrade got the thing
> up to 96k or some odd number like that.
>
> Of course, this is a vague recollection from an article in a "Hot
> CoCo" magazine a while back, so may not be completely accurate.
>
> Or it may be way off. The only part that I recall with clarity
> is that one was required to solder new chips on top of the old.


Though it wouldn't surprise me if that was also a project. For a
project in one of my CS classes here at IU, I expanded a 6800 SBC to
320K. hehe, 4k bank switching ;)

Brian

>
> Chris
>
>
> Christopher Smith, Perl Developer
> Amdocs - Champaign, IL
>
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> '
>
Received on Fri Feb 01 2002 - 10:16:40 GMT