TRS80 Model 1 video RAM (2102A)

Alexandre Souza alexandre.tabajara at
Fri Dec 1 18:54:29 CST 2017

Same happened to mine
(portuguese, but google translator is your friend :) )

2017-12-01 17:18 GMT-02:00 Adrian Graham via cctalk <cctalk at>:

> Hi folks,
> After sorting out the Model 4P (thanks to all who provided hints!) and
> scrubbing it up so it almost looks new again I turned attention to my Model
> 1 Level II which had been dead for at least the same amount of time as the
> Model 4. There’s some excellent troubleshooting tips for these machines out
> there and I quickly discovered a bad RAM chip, swap that for a NOS one and
> we’d be back in business if the video RAM wasn’t failing.
> One of the 4 2102A chips is failing (MEM SIZE becomes OEO SIZE) and I’d
> like to double check this before I stump up the ukp4 required for a pair of
> NOS ones, can anyone think of a machine from back then that also used 2102A
> or 2102LPFC or NTE2102 video RAM?
> Cheers!
>> Adrian/Witchy
> Binary Dinosaurs - Celebrating Computing History from 1972 onwards

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