On Jul 2, 2015, at 1:31 AM, tony duell <ard at
p850ug1.demon.co.uk> wrote:
Not all minis came from the States :-)
One of my favourite non-mainstream families is the Philips P800 series. It's
a 16 bit machine with 16 registers (0 is the program counter and 15
is the stack pointer, rest are mostly general purpose) and separate
I/O instructions (not memory-mapped I/O).
Another Philips machine, probably still more obscure, is the PR8000. I?ve been looking
for documentation about it, with no luck whatsoever. I wrote up a partial description,
from memory and from looking at some old listings. It?s a 24 bit machine, with 8 sets of
8 registers (memory mapped like the PDP-10). For each interrupt level there?s a set of
registers, so at interrupt time no register saving is needed. Neat.
paul