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  Description:  Read Sector Long      [PC] [AT] [PS/2]
 
  Reads a sector or sectors from disk into memory, along with a 4-byte
  ECC code for each sector.
 
  Input                                     Output
  ══════════════════════════════            ════════════════════════════════
  AH=0AH                                    If function successful
  AL=number of sectors                      Carry flag  =clear
  CH=cylinder                               AH=00H
  CL=sector (see Notes)                     AL=number of sectors transferred
  DH=head                                   If function unsuccessful
  DL=drive                                  Carry flag=set
     80H-FFH fixed disk                     AH=status
  ES:BX=segment:offset of buffer               (see Int 13H Function 01H)
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