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When the CPU uses Programmed I/O to communicate with an I/O module the CPU must periodically check the modules ________________.
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When the CPU uses Programmed I/O to communicate with an I/O module the CPU must periodically check the modules ________________.
Answer: Status bits
Programmed I/O – detail
• CPU requests I/O operation
• I/O module performs operation
• I/O module sets status bits
• CPU checks status bits periodically
• I/O module does not inform CPU directly
• I/O module does not interrupt CPU
• CPU may wait or come back later
