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   1 Name: Generic Clock (compatible)
   2 ID: 0x12d0b402
   3 Version: 1
   4
   5 Interrupts do different things depending on contents of the A register:
   6
   7  A | BEHAVIOR
   8 ---+----------------------------------------------------------------------------
   9  0 | The B register is read, and the clock will tick 60/B times per second.
  10    | If B is 0, the clock is turned off.
  11  1 | Store number of ticks elapsed since last call to 0 in C register
  12  2 | If register B is non-zero, turn on interrupts with message B. If B is zero,
  13    | disable interrupts
  14 ---+----------------------------------------------------------------------------
  15
  16 When interrupts are enabled, the clock will trigger an interrupt whenever it
  17 ticks.