[Coco] 256K J&R Banker and OS-9

Bruce W. Calkins brucecalkins at bellsouth.net
Wed Dec 28 18:06:05 EST 2005

There is a hardware fix too, although I can't cite the source at the moment.

Unquestionably this upgrade was bug ridden.

Bruce W.

> J&R's upgrade design is, as far as we know, compatible
> with the stock 64K CoCo with one exception.  A problem
> arises if you program the SAM using the CLR command,
> because a CLR command PEEKs and the POKEs 00s to
> memory.  You can fix this by replacing all offending
> CLR commands with STA commands (e.g. STA $ffc0).
> . . .

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