Keyboard interrupts

Question

Hi all, I am studying low-level device driver stuff. I am confused between interrupts and IRQ. A sample driver code that hooks keyboard suggests keyboard interrupt is 0x31 but my book on microprocessor says it is 0x09. On opening 'Device Manager->Keyboards->Resources', it shows IRQ is 1. Can anyone clarify this?

Thanks, Sanjeev

Answer 1

The simple answer is that an IRQ (Interrupt ReQuest) is a hardware input which is mapped by the system to an interrupt. In the case of the keyboard IRQ1 is mapped to interrupt 9.

The happy answer is that interrupt 31h in this context is obviously an error or typo.

Interrupt request