Processor Status Word - Revision history

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2018-12-14T21:53:49Z

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The '''Processor Status Word''' (often given as '''PS''' for short, or some variant) is a [[register]] in the [[Central Processing Unit|CPU]] which records important information about the state of the CPU.

Information typically present in the PS includes:

* whether [[interrupt]]s are enabled;
* for [[time-sharing]] machines, whether the CPU is in 'User' or '[[Kernel]' mode;
* the [[condition codes]], for machines which keep them in the PS.

Some machines (e.g. the [[PDP-10]]) include the [[Program Counter]] in the PS.

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−	The '''Processor Status Word''' (often given as '''PS''' for short, or some variant) is a [[register]] in the [[Central Processing Unit\|CPU]] which records important information about the state of the CPU.	+	The '''Processor Status Word''' or '''Program Status Word''' (often given as '''PS''' for short, or some variant) is a [[register]] in the [[Central Processing Unit\|CPU]] which records important information about the state of the CPU.

	Information typically present in the PS includes:		Information typically present in the PS includes:

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 * whether [[interrupt]]s are enabled;
-* for [[time-sharing]] machines, whether the CPU is in 'User' or '[[Kernel]' mode;
+* for [[time-sharing]] machines, whether the CPU is in 'User' or '[[Kernel]]' mode;
 * the [[condition codes]], for machines which keep them in the PS.