
                                                          Page 1


                                                     June 4, 1987


                                   TAPCOP.TXT

        Table of Contents:

             Semi-Important Information  . . . . . . . . . . . 1

             Information for RT-11, Version 4 Users  . . . . . 2

             Information for RSTS Users  . . . . . . . . . . . 3


                           SEMI-IMPORTANT INFORMATION

             Files on this tape have been named in deference to VMS Ver-
        sion 4 sites who have had trouble with three-character .DSK
        files.  Additionally, the annotated tape directory file TAPE.DIR
        has been renamed to TAPDIR.TXT to avoid making VMS think it is a
        subdirectory.

             This tape continues the Fall, 1985, SIG tape experiment to
        improve information retrievability.  We have included an index
        and a summary at the end of the file TAPDIR.TXT which references
        every submission, every author or submitter, and any key words or
        phrases which might help someone locate a submission.  If you
        find this of use, or have suggestions for improvement, please
        contact R. W. Barnard with your comments.

             The XD subdevice files are no longer included on the tape. 
        If anyone needs that capability, previous tapes have the XD
        stuff, and the section on the following page explains how to
        recover files from within subdevices without the LD handler.

             Now that RT-11 Version 5 has the LD (logical disk) handler,
        files may be easily broken down after they have been copied from
        the SIG tape.  This is done by typing the KMON command 

        MOUNT LDn FILE.DSK.

        Files within the subdevice FILE.DSK can then be copied.

             Directory listings are no longer included in the file
        TAPDIR.TXT.  At the end of each submission description, the
        number of files and the sizes of the files in each subdevice in
        the submission are given.  The sizes of the actual subdevice
        files (which are generally 8 blocks larger to include the direc-
        tory), can be determined from the RT-11 directory of the whole
        tape.  Wherever possible, subdevices have been created with only
        one directory segment to reduce the size.  Most files are no
        larger than 800 blocks (the size of a RX-50 diskette).  

                                                          Page 2


                            RT VERSION 4 INFORMATION


             If you are using RT-11, Version 4, you will need to use the
        subdevice handler XD, or any other subdevice handler you may
        have.  There are two ways to pull files from this tape.  The
        first way to pull off a submission is as follows:

        COPY/DEV/FILE MT:XXXXXX.DSK DEV:

        The above command will transfer the submission XXXXXX.DSK from
        the magnetic tape and place it on your device DEV:.  The device
        will have a regular RT-11 directory and will be usable as an RT-
        11 device.  Note that if the size of the subdevice file was dif-
        ferent from the size of DEV:, the physical device will then
        appear to have the capacity of the subdevice.

             If you do not have floppies, or you want to take advantage
        of the virtual-device system, do the following:

        First of all you need to copy the virtual-device file from the
        magnetic tape to a working disk using PIP.

        COPY MT:XXXXXX.DSK DK:

        Then attach the subdevice handler XD to the file using the pro-
        gram XDATCH.

        R XDATCH
        *XXXXXX=XD0:
        *^C

        The virtual-device XD0: is now attached and can be accessed as a
        disk device using regular RT-11 commands like DIR.  DIR XD: will
        list a directory of the virtual-device.

                                                          Page 3


                                  RSTS/E USERS


             The file VIRTUL.BAS on this tape (a submission of E. F.
        Beadel, SUNY at Oswego, Oswego, NY), will allow subdevice files
        to be read by RSTS systems.  Needless to say, it is not located
        in a subdevice file.  It can be used to break down RT-11 subdev-
        ice files after they have been copied from tape to disk.  There
        is a description and instruction section at the beginning of the
        VIRTUL.BAS file.

             If RSTS users have any trouble or questions about the usage
        of this file, please direct your questions to Mr. Beadel.

             David Smith, of Galileo Computer Center, San Francisco, CA,
        has used and modified the VIRTUL program.  He has included a few
        bug fixes and made it possible to now read multi-segment directo-
        ries.  If users have any questions or problems regarding the new
        VIRTUL, please contact Mr. Smith.
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