high moby /hi:' mohb'ee/ n.
The high half of a 512K PDP-10's
physical address space; the other half was of course the low
moby. This usage has been generalized in a way that has outlasted
the PDP-10; for example, at the 1990
Washington D.C. Area Science Fiction Conclave (Disclave), when a
miscommunication resulted in two separate wakes being held in
commemoration of the shutdown of MIT's last ITS machines, the one on the upper floor was
dubbed the `high moby' and the other the `low moby'. All parties
involved grokked this instantly. See
moby.