Word mark (computer hardware)

In computer hardware, a word mark or flag is a bit in each memory location on some variable word length computers (e.g., IBM 1401, 1410, 1620) used to mark the end of a word.[1] Sometimes the actual bit used as a word mark on a given machine is not called word mark, but has a different name (e.g., flag on the IBM 1620, because on this machine it is multipurpose).[2]

For the graphic design term, see Wordmark.

The term word mark should not be confused with group mark or with record mark, which are distinct characters.

References
  1. IBM (April 1962). IBM 1401 Data Processing System: Reference Manual (PDF). p. 20. A24-1403-5. Retrieved 2019-09-30.
  2. https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP1620.html
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