2 Jul
2015
2 Jul
'15
7:21 a.m.
2015-07-02 16:02 GMT+02:00 Paul Koning <paulkoning at comcast.net>:
That remind me of the the Norsk Data ND-10 (Maybe the ND-1 and ND-100 is
the same in this aspect) which is a 16 bit machine with 16 different
interrupt levels. Each interrupt level has its own set of registers. On top
of that it also have a memory protection scheme with four different
protection levels.
Nord-10/S front panel:
https://dl.dropboxusercontent.com/u/96935524/Datormusuem/Nord10.png
/Mattis
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