[Coco] Deal to first 3 responders

[Gene Heskett]

On Monday 24 August 2009, Ed Orbea wrote:
>Roger, in your reply you said: "...is to let anybody with a CoCo serial to
>PC
>cable, a 6551-based pak, the Forgotten Chip mod, etc". For those of us who
>are not at the same level of knowledge, what is "the Forgorren Chip mod"?
>
That was the name of an article in Rainbow, on how to install a normal acia 
(sy6551) serial comm chip, in a std coco2, and do it in such a way that under 
os9, it shared the regular serial ports connections, but with I believe, 
better flow controls.

I used that in a coco2, running os9 and a proggy I wrote in basic09, to be a 
better EDISK for a tv production video switcher known as the Grass Valley 
Groups 300 series.  It worked flawlessly for about 12 years except for losing 
3 disk controllers, presumably when mother nature walked around with her 
fireworks, which can be a problem when you have a 255' high lightning rod 50 
feet out the back door, and tied to the house electrics grounding with _very_ 
large conductors.

The chip kit in mine lived on a piece of perfboard under the keyboard, and I 
got the parts from an old DCM-300 modem.  I had it running at 2400 baud, and 
might have tried to go faster, but the next increment in the Grass was to 
38.4 kilobaud, and I knew the coco couldn't keep up with that.  It was only 4 
times faster than the $20K Grass Valley setup, so I quit while I was ahead. 
:)

I'm sure someone here can quote the issue it was in.
 
>Ed Orbea

-- 
Cheers, Gene
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