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Int 16h, 03h            Set Typematic Rate                   PCjr, XT-286, AT

    Sets the typematic rate and delay of the keyboard.

        Entry   AH = 03h
                AL = Subservice
                     0 - Return to default keyboard state
                     1 - Increase initial delay
                     2 - Slow typematic rate by 1/2
                     3 - Perform Subservices 1 and 2
                     4 - Turns off typematic characters
                     5 - Set typematic rate and delay
                            BL - Typematic rate (see below)
                            BH - Delay value (see below)

        Return  Nothing

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        Typematic Rate in Characters per Second (BL)

        BL     Rate        BL     Rate        BL    Rate
        00h    30.0        0Bh    10.9        16h   4.3
        01h    26.7        0Ch    10.0        17h   4.0
        02h    24.0        0Dh     9.2        18h   3.7
        03h    21.8        0Eh     8.6        19h   3.3
        04h    20.0        0Fh     8.0        1Ah   3.0
        05h    18.5        10h     7.5        1Bh   2.7
        06h    17.1        11h     6.7        1Ch   2.5
        07h    16.0        12h     6.0        1Dh   2.3
        08h    15.0        13h     5.5        1Eh   2.1
        09h    13.3        14h     5.0        1Fh   2.0
        0Ah    12.0        15h     4.6


        Delay Value in Milliseconds (BH)

                BH      Delay
                0       250
                1       500
                2       750
                3       1000

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    Subservices 0 through 4 are available only for the PCjr.
    Subservice 5 is available only for ATs dated 11/15/85 and after,
    and for XT-286s.

    Subservice 0 (Return to Default Keyboard State) restores the
    keyboard to its original state. The original state at power-on is
    typematic on, normal initial delay and normal typematic rate.

    Subservice 1 (Increase Initial Delay) increases the delay between
    the first character typed and the burst of typematic characters.

    For Subservices 0 through 4, each time the typematic rate is
    changed, all previous states are removed. For example, if you want
    to increase the typematic delay and the rate is currently being
    slowed, use Subservice 3 (Perform Subservices 1 and 2) rather than
    Subservice 1 (Increase Initial Delay) by itself.