AMERICAN ELECTRIC POWER SERVICE CORPORATION
                Fall 1989 VAX SIG Tape Submission


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


This is a maintenance release of AEPSC's Spring 1989 submission
containing:

  1) VDDRIVER - Virtual disk driver (no changes made).

  2) CDDRIVER - Disk data caching driver.  Bugs in the original
                submission have been fixed and the caching
                algorithm has been rewritten to use a "block-set
                associative-mapping" technique.

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.