Same happened to mine http://tabajara-labs.blogspot.com.br/2017/03/restauro-do-trs-80-model-1.html (portuguese, but google translator is your friend :) )
2017-12-01 17:18 GMT-02:00 Adrian Graham via cctalk <cctalk@classiccmp.org>: > 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 > >