INT 1aH 05H: Set Date on Real-Time Clock


 Expects: AH    05H

          CH    century, in BCD^ (19H ... 20H)

          CL    year, in BCD     (00H ... 99H)

          DH    month, in BCD    (i.e., 01H=Jan ... 12H=Dec)

          DL    day, in BCD      (00H ... 31H)


 Returns: AH    0

          AL    value written to CMOS 0bH register

          CF    NC (0) clock operating

                CY (1) clock not operating or busy being updated


    Info: Sets the date for the battery-backed CMOS Real-Time Clock.

          Input values are in BCD^; for instance, CX = 1998H = 1998.

          The BIOS avoids reentrancy by not setting the date if the clock

          happens to be in the process of being updated.  Thus, if CF is

          set on return, you should try a few more times before giving up.

See Also: INT 1aH (BIOS Time I/O)

          DOS fn 2bH (set system date)

          ROM-BIOS Functions