Comment by messe

Not the developer, just a forth enthusiast. But I'd imagine it's the ability to rapidly bootstrap on other architectures. Readability is just a bonus on top of that.

The focus of CollapseOS is, well, an OS that can be used after society has collapsed, something running on scavenged chips on hand-soldered boards (in the worst case scenario).

The original logic was the Z80 is still pretty prevalent, so it was thought to be a good choice to base the OS on.

Turns out that a Forth interpreter/compiler is incredibly easy to write (just a few hundred bytes of a assembler, a few thousand at the upper end), so by using Forth they hugely expand the range of scavengeable chips.