I scrounged one in ~1991 from the back corridors of Manchester Uni; fun machine; the CPU was a bitsliced type, common at the time using AMD chips, the microcode was loaded at boot (hence the different microcodes on the different OSs). It used a z80 on the IO board to get things started and load the microcode off disc. The UI on PNX was pretty nice as well for a machine with 1MB of RAM.
My Perq 1, had it's 14" belt driven hard drive 27MB (early Seagate), with PNX on - try fitting a Unix system with a GUI on that these days!
