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Line 937: ===I/O instructions=== The S/360 has four{{sfn\|S360\|loc=[http://bitsavers.org/pdf/ibm/360/princOps/A22-6821-7_360PrincOpsDec67.pdf#page=105 Control of Input/Output Devices]\|pp=93-98}} I/O instructions: Start I/O (SIO), Test I/O (TIO), Halt I/O (HIO) and Test Channel (TCH). All four are are privileged and thus will cause a privileged operation program interruption if used in problem state. The B<sub>1</sub> (base) and D<sub>1</sub> (displacement) fields are used to calculate the cuu (channel and device number); bits 8-15 of the instructions are unused and should be zero for compatibility with the S/370. Channel (TCH). All four are are privileged and thus will cause a privilidged operation program interruption if used in problem state. The B<sub>1</sub> (base) and D<sub>1</sub> (displacement) fields are used to calculate the cuu (channel and device number); bits 8-15 of the instructions are unused and should be zero for compatibility with the S/370. ====Start I/O (SIO)==== SIO{{sfn\|S360\|loc=[http://bitsavers.org/pdf/ibm/360/princOps/A22-6821-7_360PrincOpsDec67.pdf#page=106 ~~Halt~~Start I/O]\|pp=94-95}} attempts to start the channel program pointed to by the [[#Channel Address Word\|CAW]], using the storage protection key in the CAW. ====Test I/O (TIO)==== TIO{{sfn\|S360\|loc=[http://bitsavers.org/pdf/ibm/360/princOps/A22-6821-7_360PrincOpsDec67.pdf#page=107 ~~Halt~~Tets I/O]\|pp=95-96}} tests the status of a channel and device. It may also store a [[# Channel Status Word\|CSW]], in which case it completes with condition code 1. ====Halt I/O (HIO)====

IBM System/360 architecture: Difference between revisions