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.

(01 Jul 2002)

modal logic, MODCAL, Mode, mode, mode < Prev | Next > MODEF, MODEL, model, model

Bookmark with: icon icon icon icon iconword visualiser Go and visit our forums Community Forums