By Letter: Non-alphabet | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
  Email this page to a friend


Mode bit




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.

[Jargon File]





< Previous Terms Terms Containing mode bit Next Terms >
modal
modal logic
MODCAL
Mode
mode
addressing mode
bit
bit bashing
bytesexual
chmod
MODEF
MODEL
model
model checking
modeling


Web Standards & Support:

Link to and support eLook.org Powered by LoadedWeb Web Hosting
Valid XHTML 1.0!Valid CSS!eLook.org FireFox Extensions