Mechanical analog computers were very important in gun fire control in World War II and the Korean War; they were made in significant numbers. In particular, development of transistors made electronic analog computers practical, and before digital computers had developed sufficiently, they were commonly used in science and industry.
Kilo = 10 power 3, Mega = 10 power 6, Giga = 10 power 9, Tera = 10 power 12, Peta = 10 power 15, Exa = 10 power 18, Zetta = 10 power 21, Yotta = 10 power 24.
Week-2 Types of Computer Classification w.r.to Purposes General vs Special Purpose Computers Classification w.r.to Function or Logic used Digital, Analog & Hybrid Computers Classification w.r.to Size Super, Mainframe, Mini & Micro-Computers
Classification of Computers with respect to purposes
With respect to purposes, computers are divided into two types
General Purpose Computers
All those computers which are used for general purposes. E.g.
A personal computer used for playing games, word processing, Accounting Information System, Management Information System etc
These computers can store a huge amount of data.
PCs are the example of General Purpose Computers.
Special Purpose Computers
It is also known as dedicated computers, because these are designed to perform a particular jobs.
Perform a single & specific task . E.g.
Computer for Games, Computer for controlling traffic lights , ATM etc
These systems have predefined set of instructions permanently stored into them, that are designed to perform only one task
They are fast in processing.
Types of computer Type of computer Digital computer Analog computer Hybrid Computer Micro Computer Main frame Computer Super Computer Mini Computer
Classification of Computers According to Logic Used
Computers are classified into three types with respect to Function or Internal hardware structure or Logic used
Mainframe computers are also capable of connecting terminals with it.
These computers are used in networked environment and mainly as network servers.
Mainframe computers are very expansive. They are usually designed for the computerization of huge business organizations, universities, banks, scientific laboratories, national and international markets.
Multiple Input/Output devices are normally attached with a Mainframe computer.
The secondary storage use to be in the form disks in a Mainframe computer.
Mainframes are measured in integer operations per second or MIPS.
Example of integer operation is moving data around in memory or I/O devices.
These computers also allow different users to work on it at the same time like Mini computers but the number of users can be much more than that of the Mini computers (upto 4000 users can work at a time on a single Mainframe computer).
Application in web services and search engines, online banking (Transaction processing), weather forecasting, Climate Prediction (50 years in 30 days by 4.8 Tflops) , Cryptography, Nuclear weapons (test by simulations), Earthquake and structural modeling and petroleum exploration.