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28-06-2021
Computers and Technology

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Given that EAX contains FFFF80C0h, which of the following would be true after executing the CWD instruction?

a. AX=FFFFh, DX=80C0h
b. EDX=FFFFFFFFh, EAX=FFFF80C0h
c. DX=FFFFh, AX=80C0h
d. cannot be determined

Respuesta :

30-06-2021

Answer:

c. DX=FFFFh, AX=80C0h

Explanation:

CWD instruction set all bits in DX register with same sign as in AX register. The effect is to create a 32 bit sign result. This will have same integer value as of 16 bit.

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