CPU Architecture and Operations

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What is the primary function of the CPU?

To generate the control bus signals
To provide input/output operations
To provide memory for the system
To execute instructions and perform actions (correct)

What is the purpose of the address bus?

To send control signals to peripherals
To provide the address of the memory location to be accessed (correct)
To perform arithmetic and logical operations
To transfer data between the CPU and memory

What determines the number of memory locations that the CPU can address?

The number of ALU operations
The number of address bus lines (correct)
The number of data bus lines
The number of general-purpose registers

What is the function of the ALU in the CPU?

To perform arithmetic and logical operations (D) Signup and view all the answers

What is the purpose of the data bus?

To transfer data between the CPU and memory (C) Signup and view all the answers

Why are the outputs of many devices connected to the data bus, but only one device at a time is enabled?

To prevent bus contention and ensure data integrity (C) Signup and view all the answers

What is the range of the multiplexed address and data bus in the 8086 microprocessor?

AD0-AD15 & A16-A19 (B) Signup and view all the answers

What is the duty cycle of the single phase clock required by the 8086 microprocessor?

33% duty cycle (A) Signup and view all the answers

How many instruction bytes can the 8086 microprocessor prefetch from memory?

6 instruction bytes (B) Signup and view all the answers

What is the function of the decoder in the Execution Unit (EU) of the 8086 microprocessor?

Translates instructions into a series of actions (A) Signup and view all the answers

What is the bit width of the Arithmetic Logic Unit (ALU) in the Execution Unit (EU) of the 8086 microprocessor?

16-bit (A) Signup and view all the answers

What is the purpose of dividing the 8086 CPU into two independent functional parts?

To speed up processing by dividing the work (C) Signup and view all the answers

What is the size of each segment in the 8086 architecture?

64 kbytes (C) Signup and view all the answers

What is the primary function of the BX register?

As an offset storage for forming physical address (C) Signup and view all the answers

What is the purpose of the Data Segment Register (DS)?

To point to the data segment of the memory (C) Signup and view all the answers

What is the total memory capacity that the 8086 architecture can address?

1 megabyte (D) Signup and view all the answers

What is the use of the CX register?

As a default counter (A) Signup and view all the answers

How many segment registers are there in the 8086 architecture?

4 (D) Signup and view all the answers

What is the range of physical addresses in the 8086 microprocessor?

00000H to FFFFFH (C) Signup and view all the answers

How is the physical address calculated in the 8086 microprocessor?

Physical address = Segment address * 10H + Offset address (D) Signup and view all the answers

What is the main advantage of the segmented memory scheme in the 8086 microprocessor?

It allows the memory capacity to be 1MB (C) Signup and view all the answers

What is the purpose of relocation in the 8086 microprocessor?

To allow the program to be executed in different areas of memory (C) Signup and view all the answers

What is the condition for overlapping memory segments in the 8086 microprocessor?

CS1+IP1 = CS2+IP2 (B) Signup and view all the answers

What is the benefit of allowing code, data, and stack portions of a program to be placed in different parts of memory?

Data and code protection (A) Signup and view all the answers

In the instruction MOV AX, [5000H], what is the segment address of the data?

DS (A) Signup and view all the answers

Which register cannot be used in register addressing mode?

IP (A) Signup and view all the answers

In register indirect addressing mode, which registers can be used as the offset register?

BX, SI, DI (C) Signup and view all the answers

In the instruction MOV AX, [BX], what is the effective address of the data?

10H * DS + [BX] (D) Signup and view all the answers

What is the default segment for the index register SI in indexed addressing mode?