GENIUS KNOWLEDGE PART 2

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Hradware.

The term hardware refers to the physical components of your computer such as the system unit, mouse, keyboard, monitor etc.

Software.

The software is the instructions that makes the computer work. Software is held either on your computers hard disk, CD-ROM, DVD or on a diskette (floppy disk) and is loaded (i.e. copied) from the disk into the computers RAM (Random Access Memory), as and when required.

Hardware Components.

Input Devices -"How to tell it what to do“ - A keyboard and mouse are the standard way to interact with the computer. Other devices include joysticks and game pads used primarily for games.

Output Devices - "How it shows you what it is doing" - The monitor (the screen) is how the computer sends information back to you. A printer is also an output device.

Hardware Components.

OUTPUT DEVICES

Plotters A plotter is an output device similar to a printer, but normally allows you to print larger images.

Speakers  Enhances the value of educational and presentation products.

Speech synthesizers  Gives you the ability to not only to display text on a monitor but also to  read the text to you.

Storage Devices -- -How it saves data and programs.

 Hard disk drives are an internal, higher capacity drive which also stores the operating system which runs when you power on the computer. - "Floppy" disk drives allow you to save work on small disks and take the data with you. Hardware Components Hard Disks.

Speed:  Very fast!

 The speed of a hard disk is often quoted as "average access time" speed, measured in milliseconds. The smaller this number the faster the disk.

Capacity: --- Enormous! Often 40/80 Gigabytes. A Gigabyte is equivalent to 1024 Megabytes.

Cost: --- Hard disks costs are falling rapidly and normally represent the cheapest way of storing data. Hardware Components.

 Diskettes (Floppy Disks)

Speed:Very slow!

Capacity: --- Normally 1.44 M bytes.  Cost:  Very cheap. Hardware Components CD-ROM Disks

Speed: --- Much slower than hard disks. The original CD-ROM specialization is given a value of 1 X speed, and later, faster CD-ROM are quoted as a multiple of this value.

Capacity: --- Around 650 M bytes and more Hardware Components DVD Drives

Speed: --- Much faster than CD-ROM drives but not as fast as hard disks.

Capacity: --- Up to 17 G bytes.

Cost: --- Slightly higher than CD-ROM drives.