Int 16 Fn 03  - Keyboard - Set Typematic Rate And Delay                    [B]

   AH = 03h
   AL = subfunction
       00h set default delay and rate (PCjr and some PS/2)
       01h increase delay before repeat (PCjr)
       02h decrease repeat rate by factor of 2 (PCjr)
       03h increase delay and decrease repeat rate (PCjr)
       04h turn off typematic repeat (PCjr and some PS/2)
       05h set repeat rate and delay (AT,PS)
       BH = delay value (00h = 250ms to 03h = 1000ms)
       BL = repeat rate (00h=30/sec to 0Ch=10/sec [def] to 1Fh=2/sec)
       06h get current typematic rate and delay (newer PS/2s)

       Return: BL = repeat rate (see above)
           BH = delay (see above)

Note:  use INT 16/AH=09h to determine whether some of the subfunctions are
     supported

See Also: INT 16/AH=09h