Used to describe a person who is technically brilliant but can't seem to communicate with human beings effectively. Technically it describes a machine that has lots of processing power but is bottlenecked on input-output (in 1991, the IBM Rios, a.k.a. RS/6000, is a notorious recent example).
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Nearby terms: lost in the underflow « LOTIS « LOTOS « lots of MIPS but no I/O » Lotus 1-2-3 » Lotus Development Corporation » Lotus Notes