2015-07-02 16:02 GMT+02:00 Paul Koning <[email protected]>: > > > 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. >
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 > > paul > > >
