IBM S/360-370 IO Instruction Format. Base Add. Displacement Add. 0. 16. 20. 31. Instr: START IO, HALT IO and TEST IO - Available - busy, not operational - interrupt pending. B. D. IOP and IO Device addr. OPcode. Executed by CPU. 0. 8. 63. 32. 37. 48.
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Instr: START IO, HALT IO and TEST IO
- busy, not operational
- interrupt pending
IOP and IO Device addr
Executed by CPU
Absolute memory address
Data count (bytes)
Executed by IOP :channel command words
CPU-IOP comm. region
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