mode bit

A flag, usually in hardware, that selects between two(usually quite different) modes of operation. Theconnotations are different from flag bit in that mode bitsare mainly written during a boot or set-up phase, are seldomexplicitly read, and seldom change over the lifetime of anordinary program. The classic example was theEBCDIC-vs.-ASCII bit (#12) of the Program Status Word of theIBM 360. Another was the bit on a PDP-12 that controlledwhether it ran the PDP-8 or the LINC instruction set.

单词	mode bit
释义	mode bit mode bit A flag, usually in hardware, that selects between two(usually quite different) modes of operation. Theconnotations are different from flag bit in that mode bitsare mainly written during a boot or set-up phase, are seldomexplicitly read, and seldom change over the lifetime of anordinary program. The classic example was theEBCDIC-vs.-ASCII bit (#12) of the Program Status Word of theIBM 360. Another was the bit on a PDP-12 that controlledwhether it ran the PDP-8 or the LINC instruction set.
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