25 INT 25 - DOS 1+ - ABSOLUTE DISK READ (except partitions > 32M)
25----CXFFFF INT 25 - DOS 3.31+ - ABSOLUTE DISK READ (32M-2047M hard-disk partition)
25CDCD INT 25 - Stacker - GET DEVICE DRIVER ADDRESS
25--FFSI4358 INT 25 - PC-CACHE.SYS - INSTALLATION CHECK