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From: rh2y+@andrew.cmu.edu (Russell E. Hoffman, II)
Newsgroups: comp.sys.m6809
Subject: Re: COCO upgrade
Message-ID: <sbfCfTe00WB60DN1sG@andrew.cmu.edu>
Date: 4 Feb 91 05:02:23 GMT
Organization: Carnegie Mellon, Pittsburgh, PA
Lines: 25

Gilbert M. Sterart writes:

>[paraphrased] .. I have a CoCo I, I wanna replace it with a CoCo III,
> what can I keep / what can I throw away...

Well, you are pretty much in luck..
You can re-use the disk controller and drives. If you have the VERY old style
disk controller (v1.0 ROM instead of v1.1), you may have a small problem,
but I don't think so. The mouse and joysticks will still work fine.
Your OS9 will still work ok IF it is version 2.0 or higher. if it
is version 1.xx, you will need to upgrade to either level 1 version
2.0, or level II.
 You can throw away your chroma-luma convertor, as the CoCO III outputs
to (among other things) composite video.

As far as the CoComax goes, i'm not sure. I would assume it will still work,
unless there is an address conflict with SuperECB (addresses to E000-FFFF).
(This problem causes conflicts with J&M v1.23 disk controllers as well,
as the J&M rom is 16k long, the last 8k of which is overwritten by
SuperECB. Also causes similar problem with rs-232 pak.)

Cheers,
Russell Hoffman
rh2y+@andrew.cmu.edu
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