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# Classification of computer according to size.

## Classification of the Computer According Size.

Classification of the computer according size can be categorized with user needs and technological discoveries. It also leads to in the development of several major categories of computer systems with a variety characteristics and capabilities.

Keeping in mind following things, we can categorize and we can make classification of computer according to size.

1. Architecture means the design of the internal circuitry this include the number and type of the components that perform the actual computing task.
2. Processing Speed is the Number of Instructions That a Computer Can Process Per Second Speed Is Usually Measured in BIPS / MIPS (Billion /Millions of Instructions Per Second) Or MHz.
3. Number of Users describes how many users can access the machine simultaneously small used by several hundred users at a time.
4. Storage and Retrieval of Information that computer can store huge amount of data instructions and information on its internal or secondary storage device and the same can be easily used and retrieved.
5. The number Of I/O Devices describes how many input and output devices can be supported by the machine and user.
6. Consistency: computers do not become tired or miss concentration when execution very tedious jobs, unlike human beings, do every time same work is done with equal diligence by the computer.
7. Automatic Operation once data and program have been fed into the computer operation of the computer is automatic as per the sequence of steps defined by the program as opposed to mechanical or electronic calculator in which operator intervention is required at every step
8. Accuracy:  computer works very exactly and results are constantly same as per design accordingly software needs to be designed properly and proper checks and controls are necessary for the program and data.
9. Flexibility: general purpose computers may be used for the variety of purpose depending upon the programs fed into the computers.
10. A speed of The Output devices is how fast it can print or otherwise produce output usually the larger the computer the faster the output devices output from small computers is usually measured in characters in characters per second (CPS) while the output from larger computers is usually measured in lines per minute (LPM).

## Classification of computer according to size.

1.    Super Computer.

2.    Mainframe Computer.

3.    Mini Computer.

4. Micro computer/Personal Computer.

## 1. Super Computer.

The term describes the greatest controlling category of mainframe computers they are the greatest powerful most exclusive as well as fastest computers used for high-speed numeric computation and the vast quantity of data manipulation.

Architecture:

These are multi- processor machines mean more than one processors are used for the processing of data supercomputer internal circuitry mat contain 60 miles of wiring for the main memory alone highly trained data processing staff is required for its operation.

The number of users:

Thousands of users can access the machine simultaneously doing their own jobs every user feels that the machine is processing data supplied by him but the machine is processing the data of all the users simultaneously.

The amount of main memory:

A large amount of memory is needed in these machines as thousands of users work at the same time the memory requirements are higher because users will be storing their data temporarily in the memory.

The capacity of external storage devices:

A large amount of storage id also needed for the permanent storage of the data of thousands of user’s storages has grown up from GBs (gigabytes) to TBS (terabytes).

The number of i/o devices:

As a machine is supporting thousands of users so definitely to work with that machine thousands of i/o devices will be used;

The speed of output devices:

Speed of output devices is measured in hundreds of thousands of lines per minute (LPM);

## 2. Mainframe Computer.

Mainframe computers are less powerful not quite so fast and somewhat less expensive than are supercomputers they are often used in computers where many users at separate workstations share the same computer.

Architecture:

The circuitry for a mainframe is not so complex as is the circuitry for a supercomputer they range from uni – processor machine to multi – peripheral devices;

Effective information technology:

Processing speed:

Speed is measured in MIPS (millions of instructions per second) the speed ranges from 10 MIPS to several BIPS depending upon the machines ranging from small scale medium scale to large mainframe computer.

The number of users:

More than 1000 can be accommodated by a typical mainframe and it serves every user giving each user the idea that machine is responding him only but in actual it processes the data of all the users simultaneously;

The amount of main memory:

Main memory was measured in millions of bytes (MB) and this is going into billions of bytes (GB) in some very advanced models normally it ranges from 32 MB to over 500 MB.

The capacity of external storage devices:

Secondary storage is available in billions of bytes to store the work of hundreds of users normally it ranges from 1 GB to hundreds of GBS.

The number of i/o devices:

As a machine is supporting hundreds of users so to work with that machine thousands of i/o devices will be supported by the machine.

The speed of output devices:

Devices of output devices are measured in thousands of lines per minute (LPM).

## 3. Mini Computer.

These are minimal computers introduced by December in the mid-60s these are smaller tan mainframes having less memory and processing capabilities they are less expensive and used in small and medium size businesses.

Architecture:

The circuitry for a mini is not that much complex as the circuitry for a larger computer they are available in sizes of PC servers it can process dozens of different programs and control several peripheral devices.

Processing speed:

Speed is measured in MIPS (millions of instructions per second) the speed ranges from 10 to 300 MIPS depending upon the machines ranging from entry level to mid-range to high-end mini computers.

The number of users:

Hundreds of user can be accommodated by a minicomputer and it serves every user giving each user the idea that machine is responding him any but in actual, this is working on the data of every user.

The amount of main memory:

Main memory was measured in millions of bytes (MB) normally it ranges from 16 MB to over 500 MB depending on the computer model and the application that is being run;

The capacity of external storage devices:

Secondary storage is available in billions of bytes to store the work of hundreds of users normally it ranges from 1 GB to hundreds of GBs.

The number of i/o devices:

As the machine supports hundreds of users so to work with that machine thousands of i/o devices will be used.

The speed of output devices:

The speed of output devices is measured in thousands of lines per minute (LPM).

## 4. Micro computer/Personal Computer.

They are also referred to as personal computers (pcs) a microcomputer is the smallest least expensive but microcomputers and the remaining 10% are working with larger computer systems.

Architecture:

The architecture of these PCs are the simplest,  there is only small board inside the machine called the system or the motherboard a power supply to supply and regulate power and the drives including the floppy drive hard and the cd drive.

Processing speed:

The processing speed of microcomputers is measured in MHz and it ranges from 4.77 MHz (the oldest machine speed) to 850 and above MHz.

The number of users:

These are single user machines but can be connected to the large computer system and can be used to develop a multi – user environment through PCs.

The amount of main memory:

Today the main memory is measured in millions of bytes ranging from 4 MB to 512mb in some very high-end PC servers.

The capacity of external storage devices:

The storage capacity started in KBs but now it has entered into GBs passing through MBs today 4 GB storage capacity is very common and it is going up to 18 GBs.

The number of i/o devices:

A very limited number of i/o devices can be attached to this computer but that number is sufficient for user

The speed of output devices:

The speed of output devices is measured in character per second (cps) and ranged upto few hundred cps some advanced output devices can produce the result in lines per minute (LPM) and it is going up to 8000 LPM.