WOW!!!! $15k DEC PDP-8 CLASSIC MINICOMPUTER SYSTEM DIGITAL PDP8
ard at p850ug1.demon.co.uk
Tue Jul 12 18:24:03 CDT 2005
> On Tue, 2005-07-12 at 19:51 +0100, Tony Duell wrote:
> > > Actually, are we only counting machines that ran Unix-a-like systems, or
> > > anything in the workstation class? (i.e. does PERQ qualify? :-)
> > And just how would you describe PNX?
> > It was available for the PERQ 1 and 2 machines (AFAIK there never was a
> > version for the PERQ 2T4, and the 68020-based PERQ 3a ran nothing else).
> Ahhh... I didn't know the 3a was purely a Unix system...
> (I knew about PNX - just thought that hardly anyone ran it on the 1 & 2
> machines as everyone was running POS, and that was supposed to be the
> primary OS for the systems)
Some PERQ-fanatics don't consider the 3a to be a real PERQ. After all,
it's got a single-chip processor running a fixed instruction set (and not
a board of chips with user-modifyable microcode), it's got an
optomechanical mouse (and not an electromagnetic tablet), it's got a SCSI
disk interface (and not a custom disk controller that can put filesystem
pointers in the sector headers), etc. The 3a is almost, but not quite
'yet another unix box'. Not quite because it does have a
user-microcodable processor -- the graphics one.
On the classic PERQs (1, 1a, 2T1, 2T2), there are several available OSes.
POS is single-tasking, but has the advantage of supporting user-written
microcode. PNX is unix with a windowing front end -- it's not bad, but why
get a PERQ and just run unix on it. There's also Accent, which I know
little about other than it's muiti-user and uses something close to the
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