> On Jul 2, 2015, at 1:31 AM, tony duell <[email protected]> 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
