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Which of the processor has an internal coprocessor?

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Which of the processor has an internal coprocessor?

(a) 8087

(b) 80287

(c) 80387

(d) 80486DX

I got this question at a job interview.

I'm obligated to ask this question of Coprocessor of Intel topic in chapter Embedded Processors of Embedded Systems

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Best answer
Correct choice is (d) 80486DX

The best explanation: 8087 is an external IC designed to operate with the 8088/8086 processor but 80486DX is an on-chip coprocessor that is, it does not require an extra integrated chip for floating point arithmetics.

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