Int 2F Fn 5205  - Jam.sys V1.10+ - "unlock" - Unlock Compressed Drive      [k]

   AX = 5205h
   DL = drive number (0-default, 1-A:, etc.) to unlock

Return: AH = status (00h,01h,04h,06h,08h,09h,0Dh) (see #2521)
   AL = host drive error code (see #2285 at INT 2F/AX=0802h)

See Also: AX=5204h, AX=5206h, AX=5207h

Note:  Lock and UnLock functions were added to the JAM API to prevent
     asynchronous physical-level access (see AX=5206h,AX=5207h) to
     compressed data on JAM drives. In other words, two or more programs
     which use JAM API (say, JMAX optimizer and JCHKDSK - disk checker)
     cannot be run on the same JAM drive simultaneously.