History of Computing

This will help you understand the History of Computing!

Input Devices

Input Devices are a piece of computer hardware equipment used to provide data and control signals to an information processing system such as a computer or information appliance. Examples of input devices include keyboards, mouse, scanners, digital cameras and joysticks.
If you would like to know more about input and output devices. Visit the link above, from bbc bitesize.

Output Devices

An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) which converts the electronically generated information into human-readable form.
Reviews: Storage, input and output devices

Hard Drive

A disk drive used to read from and write to a hard disk
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Alan Turing

Alan Turing was not a well known figure during his lifetime. But today he is famous for being an eccentric yet passionate British mathematician, who conceived modern computing and played a crucial part in the Allied victory over Nazi Germany in WW2. He had played a crucial part in as he had cracked the code.

He was also a victim of mid-20th Century attitudes to homosexuality – he was chemically castrated before dying at the age of 41.

The three different types of network

Star network


Advantages and disadvantages of a star network


The advantages of a star network are:

  • it is very reliable – if one cable or device fails then all the others will continue to work
  • it is high-performing as no data collisions can occur

The disadvantages of a star network are:

  • it is expensive to install as this type of network uses the most cable (network cable is expensive)
  • extra hardware is required (hubs or switches) which adds to cost
  • if a hub or switch fails, all the devices connected to it will have no network connection

Ring Network

Advantages and disadvantages of a ring network


This type of network can transfer data quickly, even if there are a large number of devices connected because the data only flows in one direction, so there won’t be any data collisions. However, the real disadvantage is that if the main cable fails or any device is faulty, then the whole network will fail.

Bus Network

Advantages and disadvantages of a bus network


The advantages of a bus network are:

  • it is easy to install
  • it is cheap to install, as it doesn't require much cable

The disadvantages of a bus network are:

  • if the main cable fails or gets damaged the whole network will fail
  • as more workstations are connected the performance of the network will become slower because of data collisions
  • every workstation on the network "sees" all of the data on the network – this is a security risk

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Binary Coding

In mathematics and digital electronics, a binary number is a number expressed in the binary numeral system or base-2 numeral system which represents numeric values using two different symbols: typically 0 (zero) and 1 (one). The base-2 system is a positional notation with a radix of 2.

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