[TUHS] Is there a good, even definitive, list of reimplementations of the Unix kernel? What would good cut-off criteria be?

[Brad Spencer via TUHS]

Phil Budne via TUHS <tuhs at tuhs.org> writes:

> Wesley Parish wrote:
>> Not forgetting, Doug Braun's UZI - Unix for the Z80
>
> How about UniFLEX and OS-9 for the 6809?

I worked a whole lot with OS-9 on a Radio Shack CC2 and CC3 on a 6809
and 6309 in the '80s and '90s.  It was very much a Unix clone with the
commands named differently.  If you looked at the block diagram for the
OS it looks a whole lot like the early Unix systems, probably around the
Unix V5 time.  It was also a microkernel, or at the very least, a wholly
modular system with each and every device driver and device descriptor
being a module which was mostly just a Motorola S record blob.  You
concatenated the modules you wanted together and the boot loader loaded
the concatenation to create the custom system you wanted.  A K&R C
compiler was available and it wasn't that hard to port some of the Unix
utilities to OS-9.  I created a varargs library for 6809 OS-9 and ported
a number of the simpler Unix utilities to the system.  Fun times...



-- 
Brad Spencer - brad at anduin.eldar.org