I was under the impression that the pioneering Xerox systems were written in Mes... | Hacker News

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		nudq on June 19, 2019 \| parent \| context \| favorite \| on: Mezzano – An operating system written in Common Li... I was under the impression that the pioneering Xerox systems were written in Mesa, which was not even object oriented. I'd love to hear the real story as well.

pjmlp on June 19, 2019 [–]

Xerox workstations used microded CPUs, there were Interlisp-D, Smalltalk and Mesa (later Mesa/Cedar) variants of it.

Each variation loaded the respective microcode into the CPU and booted into the respective environment.

You can read all about those environments here https://archive.org/details/bitsavers_xerox

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