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  > … *nix systems will still assume that you're on a 5 bit Baudot (uppercase only) teletype …
Akshully the original 1963 version of ASCII¹, which was a 7 bit code but did not include lower case. The Model 33 teletype² (one of the terminals used by UNIX developers³, and probably a contributing factor to two-character command names) was a 1963-ASCII device. Even after 1967 ASCII added lower case, popular low end video terminals⁴ did not include it so that they could get away with 6 bits worth of printable character ROM.

¹ http://worldpowersystems.com/archives/codes/X3.4-1963/index....

² https://en.wikipedia.org/wiki/Teletype_Model_33

³ https://commons.wikimedia.org/wiki/File:Ken_Thompson_(sittin...

https://en.wikipedia.org/wiki/ADM-3A




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