[Coco] A hint for NitrOS-9, MPI, and "hard drive" PAK

[Gene Heskett]

On Thursday 19 December 2013 16:09:51 Bill Pierce did opine:

> Gene, I hope that's not the DAT board removal of the 2meg..... That
> board's directly soldered to the CPU as you well know. Hairy stuff for
> sure. If it's the memory board then no problem. I only have the 1meg
> upgrade but I know they're similar in installation, just different
> circuitry.
> 
> On another note, I wonder if it's possible to modify the 1meg board to a
> 2meg board? I would love to convert mine to 2 meg :-)
 
On that, I don't have a clue Bill.  What I do know is that the pack of 
schematics I bought from Tony, are about as bogus as a 3 dollar bill.
There are more than just "cartographers" mistakes in them.

> Bill Pierce
> My Music from the Tandy/Radio Shack Color Computer 2 & 3
> https://sites.google.com/site/dabarnstudio/
> Co-Webmaster of The TRS-80 Color Computer Archive
> http://www.colorcomputerarchive.com/
> Co-Contributor, Co-Editor for CocoPedia
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> 
> 
> 
> 
> -----Original Message-----
> From: Gene Heskett <gheskett at wdtv.com>
> To: coco <coco at maltedmedia.com>
> Sent: Thu, Dec 19, 2013 11:38 am
> Subject: Re: [Coco] A hint for NitrOS-9, MPI, and "hard drive" PAK
> 
> They will enlarge, and the detail is good, nice scan. An SC77527 failure
> is entirely possible.  I wonder if the shack (or Mark) has any spares?
> I'd imagine I'd better put a heat sink on the replacement, and in a
> socket too. I am only seeing 5 volts or nearly ground at the 4 pin din,
> which I think confirms the diagnosis.
> 
> My 2 meg memory kit covers that whole area, so that will need to go in
> order to make other measurements. Like verifying that the +-12 is
> actually getting to the salt chip.  Should be an interesting
> replacement. Not.
> 
> Thanks Luis.
> 
> 
> 
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Cheers, Gene
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