Search in: Word
Vietnamese keyboard: Off
Virtual keyboard: Show
Computing (FOLDOC) dictionary
mode bit
Jump to user comments
A flag, usually in hardware, that selects between two
(usually quite different) modes of operation. The
connotations are different from flag bit in that mode bits
are mainly written during a boot or set-up phase, are seldom
explicitly read, and seldom change over the lifetime of an
ordinary program. The classic example was the
EBCDIC-vs.-ASCII bit (#12) of the Program Status Word of the
IBM 360. Another was the bit on a PDP-12 that controlled
whether it ran the PDP-8 or the LINC instruction set.