Backing Storage Devices Input Devices Central Processing Unit (CPU) Output Devices
The central processing unit (CPU) This is the part of the computer where the searching and sorting of data, calculating and decision-making goes on. The CPU contains the processor [ Control Unit and the Arithmetic and Logic Unit (ALU) ] and the Main Memory
A WORM is a writable optical disc. An optical disc is any disc that can be read using light (normally laser light). WORM drives use a high powered laser to burn the data into the disc. This can then be read in the same way that CD-ROM's are read. Because the data is burnt onto the disc each disc can only be written once and the data written is permanent.
Magnetic tape, floppy disc, hard disc and CD-ROM are all types of backing storage. Backing Storage Devices ?
The main use of a joystick is to play computer games by controlling the way that something moves on the screen.
Joysticks can be used to control movement from side-to-side, up-and-down and diagonally.
A joystick will also always have at least one button on it which can be used to make something happen like making a character in a game jump or a gun fire.
Touch Screen A touch screen can detect exactly where, on its surface it has been touched. Touch screens are used in a lot of fast food chains and restaurants because they are easy to keep clean and re-program if changes need to be made to the menu.
With voice recognition systems the computer can understand the words spoken to it and can carry out commands associated with the words. Using voice recognition a letter can be dictated instead of being typed at the keyboard.
Handwriting can be recognised and the computer can convert the written text into typed text for storing.
Visual Display Unit (VDU) is the proper name for the computer monitor. The VDU allows us to see the output from the computer.
A plotter is a device used for creating a hard copy of the output from a computer system. Plotters use special pens to draw the output as a series of lines. Plotters are often used to output building drawings and designs.
Inkjet printers are cheaper than laser printers, they produce reasonable quality printouts (not quite as good as laser), can also printout in colour , can print 2 to 5 pages in minute but there are a little noisy.
Dot-matrix printers are the cheapest, they produce poor quality printouts, some can print in colour, they struggle to print 1 page in a minute and they are VERY noisy.