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 There are three types of computer:

1. Analog Computer.
2. Digital Computer.
   
3. Hybrid Computer.

Types on the basis of size:

1. Mainframe computer
2. Super computer
3. Minicomputer
4. Micro computer

Types on the basis of purpose:

1. General purpose
2. Special purpose computer

Types on the basis of brand:

1. IBM PC
2. IBM compatible
3. Apple/Macintosh/Mac

Types on the basis of model:

1. XT computer
2. AT computer
3. PS/2 computer

Types on the basis of operating

1. Client server
2. Peer to peer(P2P)

Analog Computer

• It handle the continuous data/ signal.
• It is measuring system(which use the physical value such as temperature/speedometer).
• These computers are fast.
• It can perform several mathematical calculations.
• It is measuring system using in scientific calculation/ operation/ equation solution.
• Special purpose computer.

Example: Speedometer, thermometer, Weather forecasting, scientific calculation, pressure, ala etc.

Digital Computer

• It handles the non-continuous data/signal/discrete signal.
• It is works on counting system.
• It is used digital form/binary form (0,1).
• Used logical value (yes/no).
• General purpose/ commercial purpose computer.
• Accuracy higher than analog due to precision value.

Example: IBM 1401, HP, Acer, Dell, Samsung etc.

On the Basis of Size

Main Frame Computer/Main Server

• Very large/ huge size computer.
• It connect more peripheral device.
• It is main server/ cabinet of computer.
• It has capability to attach thousands of peripheral device /dumb terminal Interact.
• It is also called enterprise server.
• word length 32-64 bit.
• clock speed Greater than 100 MHz.
• It can run multiple operating system/virtual machine.
• Less expensive than super computer.
• Least fast than super computer
• Used in weather forecasting, Industry etc.

Example: UNIVAC, IBM 1401, ICL 2950/10, EDSAC, ENIAC

Super Computer

• First super computer is developed by Seymour Cray the CDC company(Cray 1)
• Fastest computer.
• Largest computer than minicomputer but small than mainframe.
• Expensive computer.
• Designed for parallel processing.
• Most powerful computer.
• Also called number crunching computer/complex calculation as fast.
• 16-20 processor used.
• Single bus structure.
• It contains large number of processor.
• It used CSIC Technology in processor(process the whole instruction at once)
• It is 64 bit word length.
• Capacity is more than 10GHz
• 1TB RAM or so on.
• Storage minimum more than PB(Pet byte)

Example: Cray-1(1976), Cray 11, CYBER, HITACHI, Z800, XMP, NEC 500, Fujitsu, CLUME, Tianne-2, Mira Blue(most powerful of world Tianne-2 of China in 2014) Second powerful Titan of USA.

Minicomputer

• Also called mid-range, super and larger than microcomputer.
• Smaller than mainframe, super and larger than microcomputer.
• Support hundred user/ network.
• It is used in servers for business purpose.
• DEC company makes first minicomputer 12bit (PDP-8).
• It introduced by keeneth H. Olsen(1965)

Example: PDP-1, PDP-8, PDP-11, IBM 800(1958)

Microcomputer:

• Smallest computers than other
• Cheap computer

These Microcomputer are dividend into three category

1. Desktop Computer
2. Laptop Computer/ Notebook/ Portable computer.
3. Hand held computer/palmtop/PDA(personal digital assistance). Iphone, sonny etc.