28 Questions
What is the purpose of the OFFSET assembler directive?
To load the offset value of a variable into a register
What is the purpose of the indexed addressing mode?
To access elements of an array using an index
What is the difference between using OFFSET and the lea instruction to load the address of a variable into a register?
OFFSET can only be used for variables, while lea can be used for more complex addressing modes
When would you need to use the lea instruction instead of the OFFSET directive?
When the needed data is available at run time only
What is the purpose of the displacement addressing mode?
To add a constant to the contents of a register to get the final address
Which addressing mode is used to access array elements using an index stored in a register?
Indexed addressing mode
What does the CS (Code Segment) register store?
Starting address of the code segment in memory
How are 40-bit numbers stored after multiplication?
Most significant 40 bits in AC, least significant in MQ
What does SS (Stack Segment) register point to?
Starting address of the stack
Which register holds the starting address of an extra data segment?
ES
What is the default size of a quad word?
8 bytes
Which combination represents a default 32-bit segment and offset?
32-bit segment and offset
What does the Trap Flag (T) do when set to 1?
Enables single-step mode for processor operation
When the Direction Flag (D) is set to 1, what happens to the registers during string instructions?
Registers are automatically decremented
What does the Overflow Flag (O) indicate after a signed arithmetic operation?
Overflow of a high-order bit
What is the purpose of the I/O Privilege Level field (IOPL)?
Defines privilege level of current process
What activates the Alignment Check flag bit (AC)?
Word or doubleword addressed on a non-boundary
What does the Nested Task (NT) flag control?
Linking current process to the next process
What is the purpose of the jump operation mentioned in the text?
To specify the address of the next instruction in the program
How many classes of instructions are mentioned in the text?
5
What is the size of an instruction in the 4-address instruction format?
13 bytes
What is the maximum amount of memory that can be accessed by the 4-address instructions?
16 MB
What type of machine is based on an accumulator register?
Accumulator based machine
Which machine type works on the principle of Last In First Out (LIFO)?
Stacked based machine
What is a characteristic of an Accumulator based machine?
Second term of an operation is fetched from memory
Which machine type requires less memory access?
Accumulator based machine
In a General purpose registers machine, how are addresses designed?
With minimal bits for few registers
What is the main feature of a Stacked based machine?
Operates on the LIFO principle
Learn about the different flags in a CPU register, such as Sign Flag, Trap Flag, and Interrupt Flag, and how they affect processor operations. Explore how these flags control the behavior of the CPU during program execution.
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