1 keyboard. 2 structure is standard input device arrangement of keys ic integrated circuit
Post on 23-Dec-2015
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1
KEYBOARD
2
Structure
Is standard input device
Arrangement of keys
ICIntegrated
Circuit
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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
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Operators
Key 11-bit binary ASCII code
A 0001 1110 0100 0001
S 0001 1111 0101 0011
D 0010 0000 0100 0100
F 0010 0001 0100 0110
G 0010 0010 0100 0111
H 0010 0011 0100 1000
Bit Binary ASCII code
Compiler
Character
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Keyboard types
XT keyboard with 83 key.
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Keyboard types
AT keyboard with 84 key.
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Keyboard types
ATX keyboard with 101 -> 104 key. To connector PS2 port.
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Keyboard types
And other types...
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Connectors
DIN connector have 5 pin. Common used to mainboards support AT connector.
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Mini DIN 6 pin, used more popular with PS/2 connector.
USB connector. Infrad keyboard.
None
None
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MOUSE
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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.
Wheels mouse
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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.
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Optical Mouse
Structure
Emitting diodes
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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.
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