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INT 21 - DOS 1+ - SET SYSTEM TIME
        AH = 2Dh
        CH = hour
        CL = minute
        DH = second
        DL = 1/100 seconds
Return: AL = result
            00h successful
            FFh invalid time, system time unchanged
Note:   DOS 3.3+ also sets CMOS clock
SeeAlso: AH=2Ch,INT 1A/AH=01h,INT 1A/AH=03h,INT 1A/AH=FFh"AT&T"
See Also: 212B
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