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COS2621 Summary for Prescribed Book and NASM for DOS-Box
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COS2621 summary for the prescribed book. Summary of NASM (assembly language) bit manipulation and useful keywords.
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Available practice questions
Assembly logic, shift and rotate instructions.
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Flashcards
30 Flashcards
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Some examples from this set of practice questions
1.
Name the 4 logic instructions used in assembly for bit manipulation.
Answer: AND, OR, XOR, NOT
2.
What does the AND instruction do?
Answer: Performs a Boolean AND operation between each pair of matching bits in two operands.
3.
What does the OR instruction do?
Answer: Performs a Boolean OR operation between each pair of matching bits in two operands.
4.
What does the XOR instruction do?
Answer: Performs a Boolean exclusive-OR operation between each pair of matching bits in two operands. It is also a useful way to invert bits in an operand.
5.
What does the NOT instruction do?
Answer: Performs a Boolean NOT operation on a single destination operand.
6.
Where is the result stored of the AND, OR and XOR operations? (i.e. AND destination, source)
Answer: The result is stored in the destination, which must be a general register or a memory location.
7.
Fill in the blank. The Destination and Source cannot both be ____________.
Answer: memory locations
8.
What flags are effected by AND, OR and XOR instructions?
Answer: Zero flag (ZF), Sign flag (SF), Parity flag (PF) are affected. carry flag (CF) and overflow flag (OF) are cleared. AF is undefined
9.
Name the 4 instructions used to clear a registry.
Answer: MOV, SUB, AND or XOR instruction can be used to clear a registry.
10.
Name the 2 instructions used to clear a memory location.
Answer: MOV or AND instructions can be used to clear a memory location.
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