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Function 2Dh (45)        Set System Time

    Sets the current system time.

       On entry:      AH         2Dh
                      CH         Hour (0-23)
                      CL         Minutes (0-59)
                      DH         Seconds (0-59)
                      DL         Hundredths of a second (0-99)

       Returns:       AL         FFh       If time not set successfully
                                 00h       If time set successfully

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       Notes:         The register format of this function is the same as
                      that returned by Function 2Ch (Get System Time).