/hi:' mohB' ee/ 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 generalised 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. [Jargon File]