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The sizes of instruction and data pointer registers of 80387 respectively are

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in Microprocessor by (39.4k points)
The sizes of instruction and data pointer registers of 80387 respectively are

(a) 32-bit, 32-bit

(b) 48-bit, 32-bit

(c) 32-bit, 48-bit

(d) 48-bit, 48-bit

The question was posed to me during a job interview.

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

1 Answer

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by (49.2k points)
The correct option is (d) 48-bit, 48-bit

The explanation: 80387 consists of two 48-bit registers, known as instruction and data pointer registers.

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