The first releases of CollapseOS where developed in Z80 assembler, because Z80 is one of the more common CPU used worldwide (in 80's computers, Ti calculators,

The first releases of CollapseOS where developed in Z80 assembler, because Z80 is one of the more common CPU used worldwide (in 80's computers, Ti calculators, game consoles, printers, music synthesisers and many more). It's only recently than it was rewritten in Forth. The author explain it here http://collapseos.org/forth.html http://collapseos.org/forth.html This history is nice to read. In the same family of OS in Forth with low tech devices, there is also KnightOS: https://knightos.org/ https://knightos.org/