In the early-1970s, while working for TRW Data Systems (founded by Larry and Doug Michaels, who later founded the early commercial Unix provider Santa Cruz Operations) I led development of a proprietary OS for the Datapoint 2200.
https://en.m.wikipedia.org/wiki/Datapoint_2200
The OS ran on a descrete implementation of the 8008 processor after Intel had encountered tech and yield issues. The OS supported drivers for keyboard, CRT, disk and tape drives, telecommunications controlling dozens of specialized remote terminals, and a hashed access database, With dynamic overlays it all fit within 16 KB of RAM.

On Wed, Dec 25, 2019, 5:44 PM jim bell <jdb10987@yahoo.com> wrote:
The New York Times: Chuck Peddle Dies at 82; His $25 Chip Helped Start the PC Age.
https://www.nytimes.com/2019/12/24/technology/chuck-peddle-dead.html

6502 microprocessor.