>>LorenD+(OP)
I gave it a try many years ago and its speed was jawdropping. Too bad that a port to ARM would require a complete rewrite; those cheaper lower end *Pi-like embedded boards seem just the perfect platforms to take advantage of such a small and fast OS.
>>square+yg
If I'm not mistaken, both are written in FASM (Flat Assembler). And unfortunately FASM won't run in recent MacOSes because it's a 32-bit app. No problem with Windows/Linux, though.