Functions of Control Unit:

A control unit can be described as a sort of circuitry that supervises and controls the path of information that runs over the processor and organizes the various activities of those units that lie inside it.

• It carries out many tasks such as decoding, fetching, handling the execution and finally storing the results.

• It controls the execution of instructions in a sequential order.

• It guides the flow of data through the different parts of the computer.

• It interprets the instructions.

• It regulates the time controls of the processor.


MEMORY UNIT

The memory unit is the principal storage of the computer. All the data and instructions that the computer needs at a moment are stored here.
Functions of memory unit:
A computer memory unit is the storage where data and instructions go when entered into the computer.


ARITHMETIC LOGIC UNIT (ALU)

Arithmetic logic unit is that part of the computer which performs the different logic operations and arithmetic calculations like addition, subtraction, multiplication and division. It is the high speed digital circuit that solves calculations and does comparisons.




Functions of Arithmetic Logic Unit:

• Almost all the actions of the computer are done by it. It gets its data from a certain computer memory called processor register . After the data gets processed, its results get stored in output registers of the arithmetic logic unit .

• The arithmetic logic unit can perform integer arithmetic operations like addition, subtraction, etc.

The difference between types of primary memory and their uses (RAM, ROM).

Memory may be one of two types, known as RAM and ROM respectively.

COMPUTER RAM

RAM stands for Random Access Memory, which means that any memory location can be directly accessed by referring to its address.

Short for Random Access Memory, RAM, also known as main memory or system memory, is a term commonly used to describe the memory within a computer. Unlike ROM, RAM requires power; if power is lost, all data is also lost.

Uses of RAM:

Data and programs are transferred into and out of RAM, and the data in RAM is processed according to the instructions in the program.


COMPUTER ROM

There is a type of memory that stores data without electrical current; it is the ROM (Read Only Memory) or is sometimes called non-volatile memory as it is not erased when the system is switched off.


Uses of ROM:

ROM is used to store some of the operating system commands, and the instruction set of the computer.