Capacity of memory/computer

Capacity means The amount of information that can be stored on the medium.

Unit                 Description                Approximate Size

1 bit                1 binary digit

1 nibble            4 bits

1 byte               8 bits                            1 character

1 kilobyte       1,024 bytes                   »1/2 page, double spaced

1 megabyte    1,048,576 bytes            »500,000 pages

                       1 million bytes

1 gigabyte     1,073,741,824 bytes      »5 million pages

                      1 billion bytes 

1 terabyte       1 trillion bytes              »5 billion pages

Names of different types of keys at keyboard

It is the primary input device for entering text and numbers. A standard keyboard includes about 100 keys; each key sends a different signal to the CPU.

Names of keys

Types of Computer

1.PERSONAL COMPUTER
2.MAINFRAME COMPUTER
3.MINICOMPUTER
4.SUPER COMPUTER

Types of memory

Computer memory is any physical device capable of storing information temporarily or permanently. 

Following are the different types of memory.

1.Random access memory (RAM)
   –EDO RAM
   –SDRAM
   –DRAM

2.Read-only memory (ROM)
   –PROM
   –EPROM