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 First microprocessor - extensive article 
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Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1666
Fans of alternative micros might be interested in this extensive and well-researched article by Ken Shirriff:
The Texas Instruments TMX 1795: the first, forgotten microprocessor
(Of course, in discussions about priority you do have to define your terms carefully.)


Starting from Datapoint's 2200 who got both TI and Intel to make a one-chip version of their TTL CPU, then gave away the rights. But also mentioning Four-Phase Systems with their AL1, effectively predating Intel's offerings and TI's patent claims, but not rated as a true microprocessor by Ken. Also mentioning Viatron's System 21 product idea, a spectacular startup crash-and-burn from 1968, coining the term microprocessor but not containing a one-chip CPU. Likewise Holt's CADC processor is a multi-chip effort.

HN discussion at

Some extra materials in Ken's album at ... 6392223281

I'm very much looking forward to the next instalment: implementation and circuitry details of the TMX 1795.
(The linked pdf of Boysel's EECS presentation was very good too, although I think I've read it before)

More on the Datapoint 2200 at ... /datapoint

Mon May 11, 2015 11:12 am

Joined: Tue Jan 15, 2013 10:11 am
Posts: 114
Location: Norway/Japan
A very informative article by Ken Shirriff, thanks for posting. I pushed it to the Wayback Machine to make sure it stays out there..


Mon May 11, 2015 3:29 pm
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