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Cases
There are several different types of case designs:
- Towers: These cases stand upright and are a good solution when many disk bays are needed.
- Mini Towers: Similar to towers, but smaller in size. These are very common nowadays.
- Desktop: Traditional design where the PC sits horizontally often with the monitor set on top of it.
Keyboards
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Keyboards are input devices that connect to the motherboard and most are of the 101/102 key variety. Older AT keyboards used a 5 pin DIN connection while newer standards use a 6 pin mini DIN connector that is shown to the left.
A keyboard should never be attached or unplugged while the computer is on as the electrostatic discharge(ESD) can damage the motherboard. For obvious reasons liquids should not be spilled into a keyboard.
Because of their compact design, notebook computers use smaller keyboards that typically are of the 84 key variety. Newer versions contain Windows Keys that perform functions such as launching Windows Explorer, minimizing windows, etc. The following table lists the common Windows Keys commands.
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| Key command |
Function |
| /E |
Launch Explorer |
| /F |
Launch Find Files or Folders |
| /F1 |
Launch Help |
| /M |
Minimize all windows |
| /Tab |
Scroll through open taskbar items |
Pointing Devices
Pointing devices are input devices that include the mouse, trackball, light pen, joysticks and others. The mouse is the most common of these. Newer mice called "Wheel Mice" have a scroll wheel that allows you to scroll up and down without having to use the scrollbars in the application.
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Older serial mice plugged into a DB-9 connector shown left. Newer mice are typically PS/2 compliant and plug into a 6 pin mini DIN that are also used for keyboard connections as discussed above.
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