1. Processor Components

Which of the following is not a component of the "system bus"

• Address bus

• Data bus

• Control bus

• Command bus

Which of the following is NOT a function of the control unit

• It controls the way data moves around the CPU by controlling the buses.

• Processes calculations and logical checks

• It controls and monitors the flow of data between the CPU and other components such as input devices, memory, graphics card etc

• It executes the instructions provided by the program.

Which of the following are components of the CPU ( select as many as appropriate)

• Control Unit

• Buses

• Arithmetic & Logic Unit

• Dedicated Registers

The data moves along the data bus..

• in one direction

• in two directions

The role of the Program Counter (PC) is to...

• Hold the current instruction being executed

• Holds the address of the next instruction to be executed

• Holds the address of the memory location where data is fetched to be fetched from or written to

• Used to temporarily store data that is read from/written to memory

The role of the Current Instruction Register (CIR) is to...

• Hold the current instruction being executed

• Hold the address of the next instruction to be executed dividing it into an opcode/operand

• Hold the address of the memory location where data is fetched to be fetched from or written to

• Used to temporarily store data that is read from/written to memory

The role of the Memory Address Register is to...

• Hold the current instruction being executed

• Hold the address of the next instruction to be executed dividing it into an opcode/operand

• Hold the address of the memory location where data is fetched to be fetched from or written to

• Used to temporarily store data that is read from/written to memory

The role of the Memory Data Register is to...

• Hold the current instruction being executed

• Hold the address of the next instruction to be executed dividing it into an opcode/operand

• Hold the address of the memory location where data is fetched to be fetched from or written to

• Used to temporarily store data that is read from/written to memory

Which of the following statements is not true

• Buses typically consist of 8, 16, 32 or 64 lines

• Most modern computers use a range of general purpose registers rather than a single accumulator

• Memory is divided into units called WORDS which are variable in size

• The ALU can perform mathematics with fixed and floating point numbers, as well as logical shifts and boolean logic

Stores the results of calculations made by the ALU.

• Program Counter
• Memory data register
• Accumulator
• Current Instruction register