1. Early hard‑disk naming – “Winchester” drives
“I love that for the next few years they were commonly called Winchester drives due to IBM's original naming in the early 70's.” – ColdStream
“My dad still called it “Winchester” well into the 80s. I remember when we got our first “Winchester”, a 20 MB hard drive.” – glimshe
“As I recall 8‑inch class HDD … were called Winchester in the pre‑PC/XT era, named for the earlier IBM product, and then the terminology carried on into the microcomputer/desktop world when the 5.25″ full height HDD was introduced for the XT.” – walrus01
2. 16‑bit Unix and the memory ceiling on the 8086
“Even a scaled‑down version of Unix was too demanding for the 8086 chip.” – jmclnx
“2BSD is still hanging on getting updates and forked projects to this day… it is mainly for people who want a unix for their microcontroller.” – somat
3. DOS adopting Unix‑style concepts and hobbyist assembly work
“Unexpectedly, MS‑DOS 2.0 included a /dev directory.” – add2
“I was teaching myself 8086 16‑bit assembly a few nights ago on MS‑DOS 5.0. It was so much fun getting a color block to display on CGA.” – markus_zhang
“A lot of early DOS development was trying to see how many Unix concepts they could fit, directories, pipes, environment, devices.” – somat