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  Description:  IOCTL: Set Logical Drive Map     DOS 3.2 Only
 
  Sets the next logical drive code that will be used to reference a block
  device.
 
  Input                                  Output
  ═══════════════════════════            ═════════════════════════════════
  AH=44H                                 If function successful
  AL=0FH                                 Carry flag=clear
  BL=drive code (0=default,              AL=mapping code
      1=A, 2=B, etc.)                       00H     If only one logical
                                                     drive code assigned
                                                     to the block device
                                            01H-1AH logical drive code
                                                     (1=A, 2=B, etc.)
                                                     mapped to the block
                                                     device
                                         If function unsuccessful
                                         Carry flag=set
                                         AX=error code
                                    -♦-