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keyboard BIOS question

Discussion in 'A+' started by flex22, Oct 15, 2004.

  1. flex22

    flex22 Gigabyte Poster

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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?
     
  2. noelg24

    noelg24 Terabyte Poster

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    what? I dont understand?
     
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  3. flex22

    flex22 Gigabyte Poster

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    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:!:
     
  4. noelg24

    noelg24 Terabyte Poster

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    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?
     
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  5. christof

    christof Nibble Poster

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    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!
     
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  6. nugget
    Honorary Member

    nugget Junior toady

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    Christof, you've got the right idea mate.

    Noelg, the IRQ for the keyboard is IRQ 1.
     
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