Category: file/disk compression
INT 2F - JAM.SYS v1.10+ - "UnLock" - UNLOCK COMPRESSED DRIVE AX = 5205h DL = drive number (0-default, 1-A:, etc.) to unlock Return: AH = status (00h,01h,04h,06h,08h,09h,0Dh) (see #02835) AL = host drive error code (see #02598 at INT 2F/AX=0802h) SeeAlso: 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.