KEYBOARD TUTORIAL

KEYBOARD

WHAT IS KEYBOARD?

IT IS A DETACHABLE INPUT DEVICE WITH 101 KEYS THAT CAN BE GENERATING ALL 128 AMERICAN STANDERED CODE FOR INFORMATION INTERCHANGE (ASCII) CHARACTERS.

TYPE OF KEYBOARD:-

1. SERIAL KEYBOARD=TRANSFER DATA BIT BY BIT.

2. PARRLAL KEYBOARD=8BIT AT A TIME.

KEYBOARD CONNECTOR:-

1. SERIAL CONNECTOR= 5PIN.
2. PS₂ CONNECTOR= 6PIN.
3. USB CONNECTOR= 4PIN.

KEYBOARD KEY SWITCHES:-

1. MECHANICAL KEYBOARD KEY SWITCHES.
2. MEMBRANE.

DIFFERENT SIGNAL ARE SENT FROM KEYBOARD TO MOTHERBOARD:-

1. PIN1= DATA
2. PIN2= NOT CONNECTED*
3. PIN3= GROUND
4. PIN4= +5V DC AT 275MA
5. PIN5= CLOCK
6. PIN6= NOT CONNECTED.**

COLOUR COMBINATION

DESCRIP TION	COMMON	ALTERN ATE	ALTERN ATE	ALTERN ATE	ALTERN ATE	ALTERN ATE
+CLK	GREEN	BLUE	WHITE	YELLOW	WHITE	BLUE
DATA	WHITE	YELLOW	GREEN	RED	GREEN	YELLOW
GND	YELLOW	BLACK	ORANGE	GRAY	BLACK	WHITE
VCC	RED	RED	BLUE	BROWN	RED	ORANGE

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