Int 1A Fn 01  - Time - Set System Time                                     [B]

   AH = 01h
   CX:DX = number of clock ticks since midnight

Return: nothing

Notes: there are approximately 18.2 clock ticks per second, 1800B0h per 24 hrs
     (except on Tandy 2000, where the clock runs at 20 ticks per second)
   this call resets the midnight-passed flag

See Also: AH=00h,AH=03h,INT 21/AH=2Dh