keyboard BIOS question

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How does the CPU know that a key has been hit, for it to determine that it should use the BIOS to ask the 8042 chip to send it's scan code?

 

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what? I dont understand?

 

Of course it's the irq that initiates the CPU.

Just checking your all on the ball.Well by the lack of replies, it seems not

 

Im just trying to remember what IRQ the keyboard is again :exclaim: but flex mate I am getting really confused here...what exactly is the problem?

 

ah! just read that in the bible!

The IRQ sends a signal to the CPU via the INT wire saying the keyboard is in use. The CPU then does it's bit.

Correct me if I'm wrong. I hope I'm not or I'm screwed, cause it's only 10mins since I read it!

 

Christof, you've got the right idea mate.

Noelg, the IRQ for the keyboard is IRQ 1.