5/8     On an x86 chip and in real mode, how does software distinguish between
        IRQ5 and protection fault when an interrupt 13 occurs?  Thx.  -- yuen
        \_ once in the ISR, poll the hardware device to see if it generated
           the interrupt. sheesh, back in the day, we had ONE ISR, and we
           had to check every device.
           \_ Thanks.  What if the protection fault happens in the IRQ5
              handler?  Do I just have to ignore this case?  -- yuen