Attachment of Input/Output Devices Input/Output Devices Control Units Channels. Modes of Operation.
Types of Channels . System Operation Compatibility of Operation.
Contents Control of I nput/Output Devices Input/Output Device Addressing States of the I nput/Output System Resetting of the I nput/Output System I/O System Reset I/O Selective Reset .
Effect of Reset on a Working Device
Reset Upon Malfunction Condition Code . I nstruction Formats
List of Instructions CLEAR I/O .
HALT DEVICE HALT I/O START I/O . START I/O FAST RELEASE STORE CHANNEL ID TEST CHANNEL TEST I/O I nput/Output I nstruction Exception Handling Execution of I nput/Output Operations Blocking of Data Channel Address Word . Channel Command Word
Command Code .
Designation of Storage Area
Chaining .
Data Chaining
Command Chaining. Skipping . Program-Controlled Interruption Channel I ndirect Data Addressing
Commands
Write
Read .
Read Backward Control Sense .
Transfer in Channel. Command Retry
Conclusion of Input/Output Operations
Types of Conclusion
Conclusion at Operation Initiation I mmediate Operations .
Conclusion of Data Transfer
Termination by HALT I/O or HALT DEVICE Termination by CLEAR I/O Termination Due to Equipment Malfunction I nput/Output Interruptions I nterruption Conditions
Input/ Output Operations
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Input/Output Operations 185
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