22 8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide
1 Introduction to Programming
The questionable and operation status systems set the Operational Status
Bit (OSB) and the Questionable Status Bit (QSB). These status systems are
described in The Status Model on page 23 and Status Reporting – The
STATus Subsystem on page 55.
Unused bits in any of the registers change to 0 when you read them.
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