Does anyone have any info about 1970s-era National Semiconductor LED modules?

Ethan Dicks ethan.dicks at
Wed May 20 10:52:35 CDT 2009

On Wed, May 20, 2009 at 11:40 AM, William Donzelli <wdonzelli at> wrote:
>> If anyone would have a mid-1970s or perhaps early 1980s National
>> Semiconductor databook that covers LED displays, that might have some
>> info.  I do not (I only have NS memory/logic books).
> Cripes - of the eight shelf-feet of pre-1980 National databooks here,
> none cover the opto line.

My situation exactly.  I have lots of pre-1980 National databooks,
too.  No opto.  :-(

> I do know, however, that the modules (and
> there were many, many variants) have numbers that start with NSN, like
> NSN70 or NSN200. Back in the mid 1980s, they dumped scads of the
> things on the surplus market (think "Poly Packs").

These came in a box of ancient Radio Shack parts and such (like a
1-in-10), so that's consistent.

> National Semiconductor actually made calculators back in the 1970s...

It wouldn't surprise me that these are from one of those.


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