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  Description:  Format Track      [P] [AT] [PS/2]
 
  Initializes disk sector and track address fields on the specified track.
 
  Input                                      Output
  ═══════════════════════════════            ══════════════════════════════
  AH=05H                                     If function successful
  AL=interleave                              Carry flag=clear
     (PC/XT fixed disks)                     AH=00H
  CH=cylinder
  DH=head                                    If function unsuccessful
  DL=drive                                   Carry flag=set
     00H-7FH floppy disk                     AH=status
     80H-FFH fixed disk                         (see Int 13H Function 01H)
  ES:BX=segment:offset of address
        field list (except PC/XT)
        fixed disk, see Notes)
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