INT 1aH 01H: Set System Clock (Ticks)

                                                              [PC] [XT] [AT]
 Expects: AH    01H
          CX,DX desired tick-count setting
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 Returns: AH    0
          CF    NC (0) if no error
                CY (1) on invalid setting
          ──────────────────────────────────────────────────────────────────
    Info: Sets the system clock top the specified tick-count.

          Also clears the timer overflow flag at 0040:0070.

See Also: INT 1aH (BIOS Time I/O)
          DOS fn 2cH (get system time)
          ROM-BIOS Functions
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