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Re:KolibriOS – operating system written entirely in assembly... by unwind on Wednesday April 15, 2020 @05:07AM (#22875831)
In the Amiga demo scene, I would dare say that ASM-One [1] was the default assembler.

[1] https://en.m.wikipedia.org/wiki/ASM-One_Macro_Assembler

Re:KolibriOS – operating system written entirely in assembly... by snvzz on Wednesday April 15, 2020 @09:23AM (#22877378)
AsmTwo[0] is a decent currently maintained fork of that.

[0]: http://coppershade.org/articles/Code/Tools/AsmTwo/

Re:KolibriOS – operating system written entirely in assembly... by pjmlp on Wednesday April 15, 2020 @05:39AM (#22875967)
I was into portuguese demoscene Amiga/PC and never heard of it, then again it was back in the days when we exchanged floppies via the post.