VDDRV FOR IAS This set of programs (vddrv, vdkdrv, vdprv) is a virtual disk driver for IAS or RSX11D which was originally written about 1977. It provides virtual data disks only (must NOT run tasks from them), but allows encryption and MUCH access checking of access to the virtual disks, providing secure subsystems if this is desired. Replacing the ..BLXI or ..BLXO calls with functions that can run with no task context will allow this driver to load tasks too. Note vdkdrv is a version that does not ask passwords or provide encryption, just raw virtual disks. Glenn Everhart ASDEV and its companion program, ASSIGN, give IAS a virtual device that is terminal-like. However, input and/or output may be assigned to files, and optionally output may also go to a terminal as well as a file; the ASSIGN task controls this. It gives IAS users a means to arrange for programs that try to do I/O to terminals to have that I/O captured to a file. It was devised for use with a virtual RT11 V2C which did QIO$ directly to LP:, where the desired effect was to spool the output. However its applicability was much wider. All filename parsing is in the driver, allowing a VERY simple program interface to do file I/O (just issue a special QIO with the filename string; the driver does the rest).