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New CPU whose instruction set includes the instruction set of its predecessor CPU is said to be ___________ with its predecessor.

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New CPU whose instruction set includes the instruction set of its predecessor CPU is said to be ___________ with its predecessor.

(a) fully compatible

(b) forward compatible

(c) compatible

(d) backward compatible

The question was posed to me during an online exam.

This intriguing question originated from Registers topic in section Processor & Memory of Computer Fundamentals

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The correct answer is (d) backward compatible

For explanation: The CPU is called backward compatible since it contains the instruction set of its predecessor. Manufacturers tend to group their CPUs into families having similar instruction set.

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