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متابعة

Which technique were introduced because a single job could not keep both the CPU and the I/O devices busy?

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تم إضافة السؤال من قبل Vijai Kumar , System Support Engineer , Sybrid Private Limited, ALakson Group company
تاريخ النشر: 2015/02/21
Emad Mohammed said abdalla
من قبل Emad Mohammed said abdalla , ERP & IT Software, operation general manager . , AL DOHA Company

The technique were introduced because a single job could not keep both the CPU and the I/O devices busy.

The host repeatedly checks if the controller is busy until it is not. It is in a loop that status register's busy bit becomes clear. This is called Polling and a mechanism for the hardware controller to notify the CPU that it is ready is called Interrupt .

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