Int 1A Fn 02  - Time - Get Real-time Clock Time (at,xt286,ps)              [B]

   AH = 02h

Return: CF clear if successful
       CH = hour (BCD)
       CL = minutes (BCD)
       DH = seconds (BCD)
       DL = daylight savings flag (00h standard time, 01h daylight time)
   CF set on error (i.e. clock not running or in middle of update)

Note:  this function is also supported by the Sperry PC, which predates the
     IBM AT; the data is returned in binary rather than BCD on the Sperry,
     and DL is always 00h

See Also: AH=00h,AH=03h,AH=04h,INT 21/AH=2Ch