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To inform 80387 that the CPU wants to communicate with NPS1, the NPS1 line is directly connected to

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To inform 80387 that the CPU wants to communicate with NPS1, the NPS1 line is directly connected to

(a) A31

(b) A30

(c) M/IO

(d) D31

The question was posed to me in examination.

The origin of the question is Virtual 8086 Mode, The Coprocessor 80387 in portion 32-bit Processors-80386, 80387 and 80486 of Microprocessor

1 Answer

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by (49.2k points)
Correct option is (c) M/IO

The explanation: The NPS1 and NPS2 lines are directly connected with M/IO and A31 respectively, to inform 80387 that the CPU wants to communicate with it (NPS1), and it is using one of the reserved I/O addresses for 80387 (NPS2).

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