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  Description:  Read Sector      [PC] [AT] [PS/2]
 
  Reads one or more sectors from disk into memory.
 
  Input                                    Output
  ════════════════════════════════         ════════════════════════════════
  AH=02H                                   If function successful
  AL=number of sectors transferred         Carry flag=clear
  AL=number of sectors                     AH=00H
  CH=cylinder                              AL=number of sectors
  CL=sector                                 transferred
  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 buffer
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