[Coco] Fixing my "F" board TDP-100...

[Gene Heskett]

On Monday 20 April 2015 14:43:00 Al Hartman wrote:
> Eeek!
>
> I'll check that when I get back from the doctor's office. I'm testing
> a Coco 2 a friend gave me now.
>
> I found out why plugging in the RAM checker cartridge made the system
> go screwy. The silver label covering the window on the EPROM in the
> cartridge fell off, and it was shorting some lines on the edge
> connector. Once I removed the label, the cartridge started to work
> fine. I think I got lucky, and it didn't damage anything.

Re-cover that window as that eprom can be erased by enough uv light 
getting to it over time.  And I found many years ago, that common Scotch 
33 or similar electrical tape is actually transparent enough at UV 
wavelengths to do that, given enough time.  Scotch 88 is much less 
transparent at UV wavelengths.
>
> -[ Al ]-
>
> -----Original Message-----
> From: Darren A
>
> For an 'F' board, the PIA labeled U18 should be a 6822 (or SC67331P)
> rather than a 6821.
>
>
> - Darren
>
> --
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Cheers, Gene Heskett
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