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  Description:  Seek      [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                         If function unsuccessful
  DH=head                                Carry flag=set
  DL=drive                               AH=status (see Int 13H Function 01H)
     80H-FFH fixed disk
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