[SIGCIS-Members] history of GPIO pins and standards

[maxigas]

dear list,

i am looking for information on the history of GPIO pins, especially if
they are standardised. i find it hard to search for such books/articles
because it is a kind of strange keyword and most scholarly literature i
find it of a technical and not historical character. here is a
documentation page showing the artefact:

https://www.raspberrypi.org/documentation/usage/gpio/

thanks for your assistance,

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