Draw a flowchart similar to the one in Fig. 11-20 that describes the CPU-VO channel communication in
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Draw a flowchart similar to the one in Fig. 11-20 that describes the CPU-VO channel communication in the IBM 370.
Fig. 11-20
Transcribed Image Text:
CPU operations Send instruction to test IOP path If status OK., send start 1/0 instruction to IOP CPU continues with another program Request IOP status Check status word for correct transfer Continue IOP operations Transfer status word to memory location Access memory for IOP program Conduct I/O transfers using DMA: prepare status report 1/0 transfer completed; interrupt CPU Transfer status word to memory location
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