Word mark (computer hardware): Difference between revisions
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{{For|the graphic design term|Wordmark}} |
{{For|the graphic design term|Wordmark}} |
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{{Distinguish|Word separator}} |
{{Distinguish|Word separator}} |
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In computer hardware, a '''word mark'' or '''flag''' is a bit in each memory location on some [[variable word length computer]]s (e.g., [[IBM 1401]], [[IBM 1410|1410]], [[IBM 1620|1620]]) used to mark the end of a [[word (computer architecture)|word]].<ref>{{cite book |author=IBM |title=IBM 1401 Data Processing System: Reference Manual |date=April 1962 |id=A24-1403-5 |page=20 |url=http://bitsavers.org/pdf/ibm/140x/A24-1403-5_1401_Reference_Apr62.pdf}}</ref> 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).<ref>https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP1620.html</ref> |
In computer hardware, a '''word mark''' or '''flag''' is a bit in each memory location on some [[variable word length computer]]s (e.g., [[IBM 1401]], [[IBM 1410|1410]], [[IBM 1620|1620]]) used to mark the end of a [[word (computer architecture)|word]].<ref>{{cite book |author=IBM |title=IBM 1401 Data Processing System: Reference Manual |date=April 1962 |id=A24-1403-5 |page=20 |url=http://bitsavers.org/pdf/ibm/140x/A24-1403-5_1401_Reference_Apr62.pdf}}</ref> 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).<ref>https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP1620.html</ref> |
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The term ''word mark'' should not be confused with [[groupmark character|group mark]] or with [[recordmark character|record mark]], which are distinct characters. |
The term ''word mark'' should not be confused with [[groupmark character|group mark]] or with [[recordmark character|record mark]], which are distinct characters. |
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Revision as of 16:52, 27 May 2018
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]
The term word mark should not be confused with group mark or with record mark, which are distinct characters.
References
- ^ IBM (April 1962). IBM 1401 Data Processing System: Reference Manual (PDF). p. 20. A24-1403-5.
- ^ https://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP1620.html