1. 1 KEYBOARD

2. 2 Structure  Is standard input device Arrangement of keys IC Integrated Circuit

3. 3 Operators  Each button on the keyboard corresponding to a switch connected between a row of A and a column of B, so each key has a row and column addresses only.  When done press any key, this key will create 11-bit binary code sent to the operating system then it will change to the ASCII code and display on the screen

4. 4 Operators Key11-bit binaryASCII code A0001 11100100 0001 S0001 11110101 0011 D0010 00000100 F0010 00010100 0110 G0010 0100 0111 H0010 00110100 1000 Bit Binary ASCII code Compiler Character

5. 5 Keyboard types  XT keyboard with 83 key.

6. 6 Keyboard types  AT keyboard with 84 key.

7. 7 Keyboard types  ATX keyboard with 101 -> 104 key. To connector PS2 port.

8. 8 Keyboard types  And other types...

9. 9 Connectors  DIN connector have 5 pin. Common used to mainboards support AT connector.

10. 10  Mini DIN 6 pin, used more popular with PS/2 connector.  USB connector.  Infrad keyboard. None

11. 11 MOUSE

12. 12  Mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface  It sometimes features other elements, such as "wheels", which allow the user to perform various system-dependent operations  Types:  Wheels mouse.  Optical mouse.

13. Wheels mouse 13

14. 14  Operations  Inside the mouse ball with a rubber ball with plastic spleen in two axes placed at right angles to each other, while moving the mouse, the ball rotation => make the rotation axis, two axes are attached to plastic gears plastic perforated, each gear is placed between a emitting diodes and a optical sensor.

15. 15 Optical Mouse  Structure Emitting diodes

16. 16 Nguyên tắc hoạt động  Emitting diodes create a red light shone onto the surface of the mouse pad, image of the surface panels are lens focused onto optical sensors, optical sensors will analyze the shift of this image => create electrical signals sent to the computer.  Emitting diodes have 2 level Low level: Diode provided electric around 0.3V after about 3 seconds time in sleep mode. High level: Diode provided electric around 2.2V in active mode.