Key Board and Mouse

• The main input devices of a computer are the keyboard and the mouse.
• The keyboard is used to type text and enter commands.
• The present day keyboards have 101 or more keys.
• The keyboard has an internal microprocessor that studies the state of every key on the keyboard and sends appropriate messages to the computer.
• You can connect a keyboard to the computer through the DIN 5, PPS/2 keyboard port or the USB port.
• Cordless keyboard that run on batteries provide ease of use.
• The different type of keyboards are:

1. 101-key enhanced keyboards
2. 102-key enhanced keyboards
3. 104-key windows keyboards
4. Ergonomic keyboards 
5. Programmable keyboards
6. Cordless keyboards

• You can clean your keyboard by removing one key at a time and cleaning underneath. 
• Using blower is the easiest way to clean a keyboard, if there is no sticky substance underneath the keys.
• You must not press keys on the keyboard when the system is starting up, this will cause the keyboard to register an error.
• The mouse is a pointing device that is used to move the cursor or pointer on the screen.
• You can connect the mouse to the computer through the serial port, PS/2 mouse point or the USB port.
• A cordless mouse operates on batteries and communicates with the computer using a transceiver. 
• The different types of mouse are:

1. Mechanical mice
2. Optomechanical mice
3. Optical mice
4. Cordless mice

• When you are connecting a mouse or keyboard to the PS/2 port, you must be careful not to interchange the ports.
• You must be careful not to spill things around a keyboard or mouse, to keep then trouble-free.
• You can clean a mouse by removing the cover and cleaning the mouse ball and rollers.
• A cordless mouse may stop functioning properly because of a low battery or dirt inside the mouse.