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Register Settings and Flag Effects Quiz

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Questions and Answers

What is the value of CL after the instruction INC CL is executed?

77h

79h (correct)

80h

78h

How is the Sign Flag (SF) affected after the instruction INC CL is executed?

SF = N/A

SF = 1

SF = Undefined

SF = 0 (correct)

What is the value of the Carry Flag (CF) after the instruction INC CL is executed?

CF = Undefined

CF = 1

CF = 0 (correct)

CF = N/A

How is the Zero Flag (ZF) affected after the instruction INC CL is executed?

ZF = 0 Signup and view all the answers

What are the flag settings after the AND BL, 0FH instruction?

SF=0, ZF=0, PF=1, CF=0, OF=0 Signup and view all the answers

What does the Carry Flag (CF) indicate in the FLAGS register?

Presence of carry out from the most significant bit on addition or borrow into the msb on subtraction Signup and view all the answers

When is the Parity Flag (PF) set to 1 in the FLAGS register?

The low byte of a result has an even number of one bits Signup and view all the answers

What does the Auxiliary Carry Flag (AF) indicate in the FLAGS register?

Presence of carry out from bit 3 on addition or borrow into bit 3 on subtraction Signup and view all the answers

When is the Sign Flag (SF) set to 1 in the FLAGS register?

The msb of a result is 1 Signup and view all the answers

What does the Overflow Flag (OF) indicate in the FLAGS register?

Overflow has occurred in a signed operation Signup and view all the answers

Study Notes

Flag Register and INC CL Instruction

After the instruction INC CL is executed, the value of CL is incremented by 1.
The Sign Flag (SF) is affected by the most significant bit of the result, being set to 1 if the result is negative and 0 if it's positive.
The Carry Flag (CF) is set to 1 if there is a carry from the most significant bit, otherwise, it's 0.
The Zero Flag (ZF) is set to 1 if the result is zero, and 0 if it's not.

Flag Settings after AND BL, 0FH

The flag settings after the AND BL, 0FH instruction depend on the result of the AND operation.

FLAGS Register

The Carry Flag (CF) indicates whether an operation has generated a carry from the most significant bit.
The Parity Flag (PF) is set to 1 if the result has even parity, and 0 if it has odd parity.
The Auxiliary Carry Flag (AF) indicates whether an operation has generated a carry from the lower nibble (bits 3-0) to the upper nibble (bits 7-4).
The Sign Flag (SF) is set to 1 if the result is negative, and 0 if it's positive.
The Overflow Flag (OF) indicates whether an operation has generated an overflow, which occurs when the result is greater than the maximum value that can be represented.

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Description

Quiz: 8086 Register Settings and Flag Effects Test your knowledge of 8086 register settings and flag effects with this quiz. Analyze how the instruction INC CL affects specific flags based on given register settings. Check your understanding of flag manipulation in 8086 assembly language programming.