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Wait state
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==Alternative meaning on IBM mainframes== On [[IBM mainframes]], the term ''wait state'' is used with a different meaning. A wait state refers to a CPU being halted, possibly due to some kind of serious error condition (such as an unrecoverable error during operating system to [[IBM_System/360_architecture#Initial_Program_Load|IPL]]). A wait state is indicated by bit 14 of the [[Program status word|PSW]] being set to 1, with other bits of the PSW providing a wait state code giving a reason for the wait. In [[z/Architecture]] mode, the wait state code is found in bits 116-127.<ref>{{cite web|title=IBM Knowledge Center|url=https://www.ibm.com/support/knowledgecenter/SSLTBW_2.2.0/com.ibm.zos.v2r2.ieah700/iea3h7_Wait_State_Codes_in_z_Architecture_Mode.htm|website=www.ibm.com|date=9 December 2016 |accessdate=14 April 2017}}</ref>
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