Question

how does a cpu respond to the keyboard​

Answer 1

Keyboard input is handled through an interrupt – a signal sent to the CPU by the motherboard in response to your pressing a key. The CPU maintains a table of functions to call for each type of interrupt, and the operating system sets this so that control passes to it whenever a key is pressed.

Answer 2

Response of CPU and Keyboard:

• All keyboard must contain a processor, this processor which analyse the key matrix and identify the characters which has to send to the computer.

• It manages those characters in its memory buffer(temporary storage of memory) and then it can sends the data.

• Many keyboards are always connected to the computer through a  wire cable or USB (Universal Serial Bus) connector.

• When we click a letter on keyboard like  A, an interrupt received by the CPU.

• Then the CPU finds how to display the letter "A" pixel by pixel.

• The CPU request the step by step instruction which is stored in the memory, to draw the letter "A".

• The CPU then executes the instruction and stores the result as Pixel in the memory.

• At last, the 'pixel data is transferred in binary to the screen which is produced on the output device.

• It converts the binary signals into the spark of lights and colours that make up what we see.    

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