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    Subfunctions 00H-04H are available on the PCjr but are not supported by
    the PC or PC/XT ROM BIOS. Subfunction 05H is available on PC/ATs with ROM
    BIOS's dated 11/15/85 and later, and on the PS/2.
 
    On the PC/AT and PS/2, the value in BH controls the amount of delay
    before the first repeat key is generated, and is a multiple of 250
    milliseconds:
    Value            Delay (msec.)
    ═════            ═════════════
    00H              250
    01H              500
    02H              750
    03H              1000
 
    On the PC/AT and PS/2, the value for the repeat rate in characters per
    second can be chosen from the following table:
    Value            Repeat rate (characters per second)
    ═════            ═══════════════════════════════════
    00H              30.0
    01H              26.7
    02H              24.0
    03H              21.8
    04H              20.0
    05H              18.5
    06H              17.1
    07H              16.0
    08H              15.0
    09H              13.3
    0AH              12.0
    0BH              10.9
    0CH              10.0
    0DH              9.2
    0EH              8.6
    0FH              8.0
    10H              7.5
    11H              6.7
    12H              6.0
    13H              5.5
    14H              5.0
    15H              4.6
    16H              4.3
    17H              4.0
    18H              3.7
    19H              3.3
    1AH              3.0
    1BH              2.7
    1CH              2.5
    1DH              2.3
    1EH              2.1
    1FH              2.0
                                    -♦-