The 8550 and 8560 (I miswrote it as 8260) did use
LSI-11's. The 8550 I
think ran DOS-50 (I think it only had two 8" floppy drives), and
the 8560 was the one that ran UNIX, although I'm positive
the OS wasn't UTek. It was more an AT&T System-III variant (as
T-Nix? I seem to remember that's what the manuals that came with mine
said, anyway (I have one of each flavour, I really must dig them out and
get them fired up...)
opposed to UTek, which had its roots in 4.2bsd). I
can't
remember what they called it, but it wasn't UTek. I used
to have an 8560 with single Qume DT-8 floppy drive and the Micropolis
40MB 8" drive. Thing sounded like a small jet plane at takeoff when
It's a Micropolis 1200-series drive, also used in the PERQ 2T1. I have
service information (_real_ service information) for the drive, and a
homebrew test box that plugs into the 34 pin header on the logic board.
-tony