- Some computers are capable of catering to the needs of multiple users at the same time
- The Computers meant to be used by multiple people at a time are commonly employed by business and educational institutions such as colleges or universities and are usually present at the core of organization’s network.
- Normally every person interacts with the system using his/her device liberating the other users from taking turns at the same keyboard and monitor
- can handle thousands of individual userdused from a great distance.
- Computers meant for organizations could perform specific tasks or maybe more general purpose capable of performing a wide array of tasks.
Classification of computers used in organizations:
The computers meant to be used in an organization may be classified follows:
- Network Servers
- Mainframe Computers
- A primary computer in a network
- Individual computers connect in a network
- Centralized computer that contains special-purpose software and apparatus.
- Desktop users such as in a computer lab are permanently connected to a network server.
- Users of mobile computers such as a notebook computer can rely on the network means to connect to network server.
- Different types of servers to resources such as printing, file access, database management.
- Often a powerful desktop computer can also be a server.
- large organizations may have hundreds of servers working together at the heart of their network.
- When several servers are arranged in groups they don’t even resemble a common PC.
- A collection of servers is referred to as “server farms” or “clusters“
- We may have “rack servers” or “blade servers“
- Rack servers refer to the group of servers mounted in large racks.
- Servers reduced to small that may be slid in and out of case.
- A terminal is an I/O device that allows you to communicate with a computer that is located somewhere else.
- Usually contains a keyboard as well as a display screen such as a monitor.
Classification of Terminals
- Dumb Terminal
- Intelligent Terminal
A Dumb Terminal does not process or store data. It is simply an input-output device as a window into a computer located somewhere else.
Contains few processing capabilities but usually doesn’t have any storage.
- Used in large organisations such as insurance companies and the aviation sector where frequent access to the same data is required.
- May handle thousands of users at a time.
- Users may access a mainframe computer using a terminal or a standard PC.
- Through extremely powerful they are not flexible as they perform a specific set of tasks.
- If ever book a seat on the airline’s website you must carry out a transaction with the main computer.
- Mainframes are normally housed in special rooms so that they keep out of the reach of users
- Minicomputers were initially released in the 1960s and their size was comparably smaller than computers of that time hence they were named microcomputers
- Often called midrange computers as their power lies somewhere in the middle of the desktop PC and mainframe.
- May meet the processing needs of small organization action.
- Although meant for a single user, a powerful mini-computer cater to the needs of thousands of users simultaneously.
- Use may use a terminal or a standard PC to access a centralised computer.
- Among all computers, supercomputers are the most powerful and are also some of the largest in terms of size.
- Handle large and complex calculations.
- Capable of performance trillions of calculations per second.
- Some supercomputers may contain thousands of processors.
- Supercomputers are common in academic and research environments. Few government agencies and very large businesses use them as well.
- Supercomputers are ideal for handling large and highly complex problems that require extreme calculating power.
- Their enormous processing power makes them suitable for solving complex problems that demand massive computation capacity.
Uses of supercomputers
- Genetic Engineering
- Weather Forecasting
- Nuclear Reactors
- Predicting climate change.
- Oil and gas exploration