Fundamentals of Computer > Input Devices > How does the Computer Accepts Input from the Keyboard

Stemps to Accepts Input from the Keyboard

1. When a key is pressed on a keyboard, the keyboard controller places the ASCII Code of the key to the keyboard buffer.

              (keyboard buffer is a part of keyboard controller’s memory  that holds data temporarily until it can be processed)

 

1. The keyboard controller then sends an interrupt request (IRQ) to the system software indicating that something has happened at the keyboard.
2. The system software responds to the interrupt request by reading the ASCII Code from the keyboard buffer. It then passes the scan code to the CPU.

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