
[307,20]README.1ST        U.S. Geological Survey, Menlo Park, California

Spring 1987 RSX SIG Tape Submission

This directory contains a new release of a Virtual Disk driver and
associated utilities for RSX-11M-Plus and Micro/RSX versions 3.0 and
higher.

This package is a complete rewrite based on the previous work of
Stamerjohn, Mearns, and Everhart, and incorporating the following
new features:

	- Support for shadowing of virtual disks
	- Support for virtual disks contained on shadowed volumes
	- Dynamic device database creation
	- Logically contiguous volumes created from multiple
	  container files
	- Virtual device naming liberties
	- User-controllable container file locking and 
	  write protecting
	- Support for up to sixteen container files per virtual unit
	- Use of secondary pool for container file data structures
	- Use of advanced RSX-11M-Plus features
	- Vectored utility programs

Please refer to the release notes for additional information.

The following files are in this directory:

     README.1ST     - You're reading it right now
     VFGEN.CMD      - Command file to build the works
     RELEASE.RNO    - Release notes and user guide (Bonner format)
     RELEASE.DOC    - Output file from RELEASE.RNO
     V21.CHG        - Description of change required to M-Plus V2.1
                      $IOFIN routine in IOSUB to get this to work
                      (implements internal I/O scheme).

     VFPRE.MAC      - Assembly prefix file

     AVF.MAC        - Source files for AVF
     AVFERR.MAC
     AVFHRC.MAC

     DVF.MAC        - Source files for DVF
     DVFERR.MAC

     VFDRV.MAC      - Source files for driver
     VFTAB.MAC

     AVF.SAV        - Non-vectored version of AVF
     DVF.SAV        - Non-vectored version of DVF
     
     VFL.FTN        - Task for logging VF: driver packets
     VFLBLD.CMD
