Eccmid 2024 Programmed I/O. The processor does not wait until the i/o operation is completed. Eucast was formed in 1997.
The processor does not wait until the i/o operation is completed. Simplest and least expensive scheme device controller bus address bus to select a memory location or i/o device data bus to transfer data hardware buffer handshaking protocol disadvantages poor resource utilization only one device active at a time gross mismatch between the speeds of cpu and i/o devices cpu and i/o.
Here We See How Interrupt Driven I/O Data Transfer Work.
The cpu periodically manually checks if there are any i/o requests available.
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But With Respect To Programmed I/O, Synchronous Mostly Means That The Cpu Is Synchronized With Each Byte/Word Being Transferred.
Data transfer is initiated by the means of instructions stored in the computer program.
The Processor Does Not Wait Until The I/O Operation Is Completed.
