Not that I want to provide the canonical list of 88k
machines, but I'm
guessing DG sold the most 88000 machines. I personally used a Tektronics
XD88, which was a beast performer at the time. Encore built a big 88k
multi, as did BBN. There were a lot of MVME-based systems, with various
badges. There are a bunch of rare/odd machines as well (the Omron Luna is
significant because of it's role in developing Mach). As one poster pointed
out, Apple considered using the 88000 (including
producing prototype
hardware and partially porting MacOS), as did NeXT.
The Apollo Domain DN10000 used up to (was it 8?) 88k cpu's... it
was modular in some way, so that a system could be expanded.
I hope to add a DN10000 to the collection, eventually...
-dq