Weird Lear-Siegler ADM-3A board

Jon Elson elson at
Fri May 25 20:36:20 CDT 2018

On 05/25/2018 02:58 PM, Adrian Graham via cctalk wrote:
> 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 <>
That looks a bit like a clone of the Term-Mite development 
board for the NS405.
I suspect somebody just used the ADM-3A housing, monitor and 
maybe power supply components
to hold their updated terminal.


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