iShariful iShariful

01-06-2020
Computers and Technology

contestada

Suppose an 80286 microprocessor is in protected mode. How it is switched back
to real address mode operations.

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sqdancefan sqdancefan

11-06-2020

Answer:

hardware-initiated reset

Explanation:

Once in protected mode, the 80286 is designed to remain there until it is reset by hardware.

__

External hardware can be designed so that software can cause such a reset. In the 1984 PC/AT, such hardware combined with code in the BIOS allowed real mode re-entry and returned execution control to the program that caused the reset.

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