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In ‘Rotate source, count’ instructions, if the CF is equal to MSB of operand (source) then

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In ‘Rotate source, count’ instructions, if the CF is equal to MSB of operand (source) then

(a) TF is cleared

(b) OF is cleared

(c) TF is set

(d) OF is set

This question was addressed to me in semester exam.

This interesting question is from Instruction Set Features -2 topic in chapter 80286-80287-A Microprocessor with Memory Management and Protection of Microprocessor

1 Answer

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by (49.2k points)
The correct choice is (b) OF is cleared

Explanation: If CF is equal to MSB of operand (source), the overflow flag is cleared, otherwise, it is set to 1.

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