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Input/Output_2 (Interrupts (Examples (abnormal situation, such as power…

- - - - Take the form of special programs
      - Executed whenever triggered by
        an interrupt signal
      - Cause temporary suspension of the
        programs in progress
    - - Program that services the interrupt
      - Also known as interrupt routines
        or device drivers
    - - A modern PC may contain as many as
        32 interrupt lines; labelled as IRQ0
        to IRQ31 (Interrupt ReQuest)
      - The messages sent to the computer
        on these lines are known as interrupts
      - One or more special control
        lines to the CPU
    - - Save registers of a program before control
        is transferred to the interrupt handler
      - Allows program to resume exactly where
        it left off when control returns to the
        interrupted program
- - - - Are there any other
        interrupts awaiting service?
      - How does the computer
        identify the interrupting device?
- - - - Starting location
        in memory
      - Size of the bloc
        to be transferred
      - Location of data
        on I/O device
      - Direction of transfer:
        read (I/O to memory) or
        write (memory to I/O)
  - - - The I/O interface & memory
        must be connected
      - The I/O controller must be capable
        of reading & writing to memory
      - Conflicts btwn the CPU & the
        I/O controller must be avoided
      - Interrupt required for completion