Last time I checked there were few resources on CP/M-86 Assembly programming, not so much on x86 instructions but on the system itself and its access from Assembly. So I've bookmarked these manuals I've come across which I missed in the past or were posted recently.
https://dn790000.ca.archive.org/0/items/cp-m-86-programmer-guide/CP%3AM-86ProgrammerGuide_text.pdf
http://bitsavers.informatik.uni-stuttgart.de/pdf/nec/APC/NEC_APC_CPM86_Programmers_Guide_Aug83.pdf
You know, I'm something of a prompt engineer myself.
Nemanja Trifunovic revisits the story of why IBM went with MS-DOS instead of CP/M and discusses one important detail: why the 8086 port of CP/M was late and how much this influenced what followed.
https://nemanjatrifunovic.substack.com/p/the-late-arrival-of-16-bit-cpm?utm_medium=web
CP/M 86, le dernier d'une longue lignée...
This 1982 interview with Gary Kildall is interesting because it focuses on CP/M-86 which is little known.
It made me notice a difference with MS-DOS I hadn't thought of before. Like Unix and unlike MS-DOS, CP/M-86 shipped with a complete software development environment with tools such as an assembler, which might have contributed to the higher price.
https://computeradsfromthepast.substack.com/p/gary-kildall-has-a-talk-with-pc-magazine
https://julianehehl.de/test-ndr/ndrliteratur.htm#top
Joy another time-sink, another CP/M BASIC!
And it's supposedly based off of TDL BASIC, one of the better non-ms BASICs.
The docs seem to be in German only so I might be able to resist (I can't read German 😢)
Special for @amoroso there's also a cpm86 version...
I once spent way too long getting an early version of TDL BASIC working under CPM and then never did anything with it.
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