[Coco] 128K CoCo2

[Joe Grubbs]

Yeah I'd have to write my own code to take advantage of the extra 64K. Just curious if anyone here has actually performed the upgrade and if 128K is the practical limit before doing some massive surgery.

FWIW the article can be found on page 162 of:
http://www.colorcomputerarchive.com/coco/Documents/Magazines/Rainbow,%20The%20%28Clearscan%29/The%20Rainbow%20Vol.%2004%20No.%2005%20-%20December%201984.pdf



> From: os9dude at gmail.com
> Date: Sun, 19 Apr 2015 14:41:18 -0400
> To: coco at maltedmedia.com
> Subject: Re: [Coco] 128K CoCo2
> 
> On Sun Apr 19 2015, Joe Grubbs wrote:
> 
> 
> > While searching for the reverse video mod in old issues of Rainbow, I
> > stumbled upon an article detailing a simple way to take a CoCo2 to 128K.
> >
> > Has anyone ever done this? And is 128K the upper limit *without* doing
> > massive surgery? This circuit was nice because it retained the SAM, added a
> > few logic ICs, and used a piggyback set of 4164s
> >
> 
> There were several options to go 128k on the CoCo 1/2 and all of them - if
> I recall correctly - were straightforward 32k bank switching schemes, there
> was no way for plain old Basic to access the extended RAM for programs but
> only as a RAM disk or printer spooler.  Maybe OS9 could make better use of
> the extra RAM.
> 
> Don't recall ever seeing any software marketed for 128k.
> 
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