Weird Lear-Siegler ADM-3A board

Adrian Graham binarydinosaurs at
Fri May 25 14:58:40 CDT 2018

Hi folks,

A friend of mine has said ADM-3A and is baffled by the tiny board it contains, not the usual ‘covering entire base’ discrete logic board they normally have. Centre of this board is the Nat Semi NS405 ‘display processor on a chip’ which is obviously why the board is so small but neither of us have seen this before in a 3A.

Anyone else? Pic at <>


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