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A proof of concept Z80 Assembly program that "[...] simulates task multitasking that can run up to eight separate tasks at the same time." It requires a specific hardware and software setup.
https://github.com/bchiha/Ready-Z80/tree/main/29-Multitasking
Was doing mulitasking in Z80 CP/M boxes in FIG-Forth in the early '80s, was much better development environment than burning EPROMS for our embedded systems.
Mostly Xerox 820, but ran the same FORTH code on PDP-11 under RSX-11 and Version 7 UNIX. Also Apple II (though it didn't generalize as well because Page 0 was a bitch).
Also did some work on Cromix, a UNIX lookalike that ran on CP/M-compatible Z80 hardware.
@resuna Did the Xerox 820 run Forth?
It ran CP/M, ran FIG Forth-77 on it with a multitasking kernel in under 50 lines of Forth.
I'm about to release my MP/M II machine. Emulated z80 and devices but all 8080 multiprocessing and preemption. Runs four CP/M programs at once. Digital Research code. It's shockingly effective. 1981.
@tomjennings At the time of MP/M both the technology of and the use case for multitasking were new, especially the latter in the micros market.
People writing antique assembly are a special breed.
Here's an account of a humorous paper doing some 6502 assembly for "stunt factoring" in crypto:
@weekend_editor In a previous life I wrote a toy 8080 assembler.
@amoroso why not ENIAC
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