mart/ex09/explanations.txt

   1 9a1.
   2 The program just prints the number of keyboard interrupts, these are interrupts
   3 for press, release and hold.
   4
   5 9a2.
   6 It happens that within the spinning the keyboard handler prints the number of
   7 keypresses. This is because the priority is set to 257 because it's an
   8 interrupt handler.
   9
  10 9b.
  11 The program prints all interrupts, so a different for press and release.