On: Got an old Raspberry Pi spare? Try RISC OS. It is,...

[lproven]

RISC/ix?

It was based on BSD 4.3. The efforts went into BSD 4.4 and that went into NetBSD and NetBSD 1.2 incorporated Acorn's ARM port.

https://groups.google.com/g/comp.sys.acorn/c/G19nI9eac-o/m/q...

https://www.netbsd.org/changes/changes-1.2.html#port-arm32

I'd say that the bits that matter mostly survived and still do.

[rbanffy → lproven]

For me, the desktop apps are vitally important to rebuild the experience.