Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 13h Function 0Ch
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  Interrupt:   13h     Function:   0Ch
 
  Title:       Seek
 
  Description:                                          [PC] [AT] [PS/2]
 
     Positions the disk read/write heads to the specified cylinder, but
     does not transfer any data.
 
     Input                             Output
 
     AH = 0Ch                          If function successful
     CH = Lower 8 bits of cylinder       Carry flag: clear
     CL = Upper 2 bits of cylinder       AH = 00h
          in bits 6-7
     DH = Head                         If function unsuccessful
     DL = Drive                          Carry flag: set
        = 80h-FFh fixed disk             AH = Status
                                              See: Int 13h Function 01h
                                    -♦-