Weird Lear-Siegler ADM-3A board

Adrian Graham binarydinosaurs at
Fri May 25 16:30:49 CDT 2018

> On 25 May 2018, at 22:04, Adam Sampson via cctalk <cctalk at> wrote:
> Adrian Graham via cctalk <cctalk at> writes:
>> 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.
> Here's a similar one that was on eBay a couple of years ago (the full
> listing has pictures of the insides):
> The September 1986 date on the case of yours means that it dates from
> around the time when Lear-Siegler sold their terminal business to
> Zentec -- is it actually badged Lear-Siegler?

Wow, good spot! This one isn’t badged but we just assumed it had fallen off. Just as I’m typing this he’s messaged me to say it’s actually the ADM-3A ‘10th Anniversary edition’. The manual is on bitsavers: <>

I do love a happy ending to a search :) Cheers!

Owner of Binary Dinosaurs, the UK's biggest home computer collection?
t: @binarydinosaurs    f:

More information about the cctech mailing list