Int 2F Fn 4A11  - Dblspace.bin - "getdrivemapping" - Get Drive Mapping     [k]

   AX = 4A11h
   BX = 0001h
   DL = drive number (0=A:)

Return: AX = status (see also #2490)
       0000h successful
       if DL was compressed drive,
           BL = host drive (bit 7 set if drive is compressed)
       else if DL was host drive,
           BL = compressed drive
       else
           BL = specified drive (if available for DoubleSpace)
       BH = DoubleSpace sequence number
       other error code (0101h) (see #2490)
       apparently never returned for the MS-DOS 6.2 DoubleSpace

Note:  the compressed volume file for the specified compressed drive is
     host:\DBLSPACE.sequence

See Also: AX=4A11h/BX=0000h

(Table 2490)
Values for DBLSPACE function status:
 0000h successful
 0100h bad function
 0101h invalid drive
 0102h not a compressed drive
 0103h drive already swapped
 0104h drive not swapped

See Also: #2492