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   1 Name: Generic Keyboard (compatible)
   2 ID: 0x30cf7406
   3 Version: 1
   4
   5 Interrupts do different things depending on contents of the A register:
   6
   7  A | BEHAVIOR
   8 ---+----------------------------------------------------------------------------
   9  0 | Clear keyboard buffer
  10  1 | Store next key typed in C register, or 0 if the buffer is empty
  11  2 | Set C register to 1 if the key specified by the B register is pressed, or
  12    | 0 if it's not pressed
  13  3 | If register B is non-zero, turn on interrupts with message B. If B is zero,
  14    | disable interrupts
  15 ---+----------------------------------------------------------------------------
  16
  17 When interrupts are enabled, the keyboard will trigger an interrupt when one or
  18 more keys have been pressed, released, or typed.
  19
  20 Key numbers are:
  21         0x10: Backspace
  22         0x11: Return
  23         0x12: Insert
  24         0x13: Delete
  25         0x20-0x7f: ASCII characters
  26         0x80: Arrow up
  27         0x81: Arrow down
  28         0x82: Arrow left
  29         0x83: Arrow right
  30         0x90: Shift
  31         0x91: Control