[Coco] 128K CoCo2

[Rogelio Perea]

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.