CD - ROM
A CD-ROM is a type of Compact Disc (CD) that can be used to produce images on a computer screen. Rom Stands for Read only Memory, which means that the digitally recorded data registered in pits on the surface of the disc is fixed and cannot be altered or replaced.
The CD is loaded into the CD-Rom player, where the data on the spinning disc is read by a laser.
CD-Roms are different from vinyl records in that they are not read along a spiral groove, from outer circumference to inner edge; instead each image or piece of information has a co-ordinate on the disc, which is located by the laser.
Information picked up by the laser is relayed to the computer, where it is translated into the text and images that appear on screen.
The information is relayed through a SCSI (Small Computer System Interface), which processes the electronic impulses between the disc drive and the computer system.
The User can move around the program by clicking on different parts of the screen with a mouse ( a hand-held tool with a clicking button whose movement on its pad is mimicked by an icon on the screen).
The image in the viewing area can be changed by clicking on the active scrolling button; this moves a rectangular panel down the scrolling figure in the navigational panel.
Clicking on active text will provide a new screen with more information, either in the form of text and diagrams, or as narrated animated sequences.
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