Weird Lear-Siegler ADM-3A board

Eric Smith spacewar at
Tue May 29 02:07:38 CDT 2018

On Fri, May 25, 2018 at 1:58 PM, Adrian Graham via cctalk <
cctalk at> 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's the Zentec ADM3 retrofit:

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