[Coco] 256k upgrade

[Bruce W. Calkins]

Well, I do have possession of the upgrade, the docs and the Rainbow 
Magazines.

Unfortunately about 98.5% of my hobby stuff is now in storage and my CoCo 
stuff is not in front.  I'll see what I can do, when I get a Round-Tuit.



Mike, IIRC you are right about it including the 74LS785 SAM.  That part 
might be harder to find than a Round-Tuit, although the last version of the 
CoCo 2 used it.



One Caveat;  they provided support for OS-9 Level 1, but no one has yet 
figured out what needs correcting for NitrOS9 Level One.  Quite simply, 
NitrOS9 will not boot.