Microprocessor: Difference between revisions

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Texas Instruments TMX 1795 (1970–1971): righto blog archive on https://web.archive.org/web/20160722052212/http://www.righto.com/2015/05/the-texas-instruments-tmx-1795-first.html changed intro from "...why the TMX 1795 should be considered the first microprocessor" to "...how the TMX 1795 almost became the first microprocessor. (Originally I thought the TMX 1795 was the first microprocessor, but it appears that the 4004 slightly beat it.)" Rm "working" from protype, was interrupt problem.
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====Texas Instruments TMX 1795 (1970–1971)====
Texas Instruments developed in 1970&ndash;1971 a one-chip CPU replacement for the [[Datapoint 2200]] terminal, the TMX 1795 (later TMC 1795). Like Intel's later [[8008]], it was rejected by customer Datapoint. According to Gary Boone, the TMX 1795 never reached production. Still it reached a working prototype state at 1971 February 24, therefore it is the world's first 8-bit microprocessor.<ref name="righto_com">{{cite web | url=https://www.righto.com/2015/05/the-texas-instruments-tmx-1795-first.html | title=The Texas Instruments TMX 1795: The (Almost) first, forgotten microprocessor }}</ref> Since it was built to the same specification, its instruction set was very similar to the Intel 8008.<ref name="genie">{{cite book |first1=Frederick |last1=Seitz |first2=Norman G. |last2=Einspruch |chapter=19. The 1970s and the Microprocessor § Texas Instruments |title=Electronic Genie: The Tangled History of Silicon |publisher=University of Illinois Press |date=1998 |isbn=0252023838 |pages=228–9 |chapter-url=https://books.google.com/books?id=IT90cDPh54wC&pg=PA229 |access-date=14 August 2022 |archive-date=19 February 2023 |archive-url=https://web.archive.org/web/20230219195307/https://books.google.com/books?id=IT90cDPh54wC&pg=PA229 |url-status=live }}</ref><ref name="shirriff">{{cite journal |first=Ken |last=Shirriff |title=The Surprising Story of the First Microprocessors |journal=IEEE Spectrum |volume=53 |issue=9 |pages=48–54 |date=2016 |doi=10.1109/MSPEC.2016.7551353 |s2cid=32003640 |url=https://ieeexplore.ieee.org/document/7551353 |access-date=14 August 2022 |archive-date=14 August 2022 |archive-url=https://web.archive.org/web/20220814014410/https://ieeexplore.ieee.org/document/7551353 |url-status=live }}</ref>
 
====Texas Instruments TMS 1802NC (1971)====