Input & Output Device:
Input Device: The device through which a computer takes input is called as Input Device.
Example:Mouse, Keyboard, Scanner, Joy stick, Driving Wheel, Screen touch monitor, light pen, Microphone etc.
Output Device: The device through which a computer gives only information to its user is called output device.
Example:Monitor, Speaker, Printer and Plotter etc.
CPU (Central Processing Unit):CPU is the main processing unit of a digital computer. The data taken by input device is processed here and turned into information.
There are three main components in CPU;
- ALU (Arithmetic logic unit).
- CU (Control unit).
ALU (Arithmetic logic unit): ALU is the main block which does all types of arithmetic operation. Some logical operation is also done by ALU.
CU (Control unit): Control unit is the main control portion of a computer. It controls which task or work will be done at first.
Register: Register is one type of memory which is situated within CPU.
Memory:Memory is the main portion where all kinds of data are stored. CPU takes data from memory when it wants.
RAM (Random Access Memory): The information stored in RAM depends on the electric power. When the power goes off all the information get removed from RAM. RAM is also called as volatile memory.
- S-RAM (Static RAM): S-RAM is fast and expensive. Storage space is low.
- D-RAM (Dynamic RAM): D-RAM is slower and cheaper than S-RAM. D-RAM has high storage space.
ROM (Read only Memory): All the things are stored into ROM using logic gate. ROM is non-volatile type. So, if the power goes off all the things will be still stored in ROM. Different types are ROM are there;
- E. ROM(Erasable ROM)
- P. ROM(Programmable ROM)
- E.P ROM(Erasable Programmable ROM)
- E.E.P ROM(Electronically Erasable Programmable ROM)
- Asynchronous SRAM.
- Synchronous Burst SRAM.
- Pipeline Burst SRAM.