AMERICAN ELECTRIC POWER SERVICE CORPORATION
               Spring 1989 VAX SIG Tape Submission

                       Paul R. Sorenson
                       AEP/Engineering Computer Support Center
                       1 Riverside Plaza
                       Columbus, OH 43215



This submission to the Spring 1989 VAX SIG tape contains:

  1) VDDRIVER - yet another version of a virtual disk
                driver (VD:) !?  There was confusion on
                my part as to whether previous versions
                handled segmented virtual I/O properly,
                so this version was born.

  2) CDDRIVER - disk data caching driver.  Hooks into
                a standard disk driver and caches the
                most recently accessed blocks in
                memory.  Also provides a "recording"
                function to log all I/O performed on
                the disk.

Consult the AAAREADME.TXT files in each subdirectory for more
information on the features of each driver.  Note that by
creating a virtual disk and creating the same sized cache for
the virtual disk, one can approach the I/O performance of a
memory disk while always maintaining an up to date copy of the
data on a physical disk.


                        DISCLAIMER

All programs, information, and copies are provided "As Is".  American
Electric Power Service Corporation and the contributor disclaim all
warranties on the programs, including without limitation, all implied
warranties of merchantibility and fitness.