ExtenDOS Patch Archive 121

          This patch archive will update all previous
          versions of ExtenDOS to version 1.21.

Introduction
============

  This patch updates Anodyne Software's ExtenDOS package to
  version 1.21.  After applying this patch, you will have the
  following versions of these ExtenDOS modules:
      CD.BOS         1.6
      EXTENDOS.PRG   1.4
      TRACE.TTP      1.6
      UNIDRIVE.DOS   1.5
      UNI_BDDS.DOS   1.5

  NOTE: All users of ExtenDOS version 1.20 should apply this patch
  since it fixes several significant problems in version 1.20.

  We also strongly recommend that all users of ExtenDOS v1.0, v1.1,
  and v1.11 apply this patch.

  Any questions or comments, please contact us at:

      Anodyne Software, 6 Cobbler Court, Ottawa, Ontario K1V 0B8, Canada.
      GEnie:    R.BURROWS1
      Internet: r.burrows1@genie.geis.com


Archive contents
================

  This archive contains the following files:

      PATCH121.TOS   Patches the main ExtenDOS modules
      CHECKIT.TOS    Checks the patched files
      CHECKIT.CTL    Control file for CHECKIT.TOS
      TRACE.TTP      Replacement for existing TRACE.TTP
      READ.ME        Important documentation on version 1.21
      READ_ME.1ST    This file

  These files are copyright ½ 1994 by Roger Burrows.  All rights are
  reserved.  These files may be freely distributed to all legitimate
  registered users of ExtenDOS.


What is needed to update
========================

  .   This archive file, and:

  .   An un-modified ExtenDOS distribution diskette, version 1.20, or
  .   An un-modified ExtenDOS distribution diskette, version 1.11, or
  .   An un-modified ExtenDOS distribution diskette, version 1.1, or
  .   An un-modified ExtenDOS distribution diskette, version 1.0.


How to update
=============

  1.  Make sure you have made a backup copy of the ExtenDOS distribution
      diskette.

  2.  Copy the PATCH121.TOS file to the ExtenDOS distribution diskette.

  3.  Run PATCH121.TOS by double-clicking on it from the desktop.  For
      each of the modules CD.BOS, EXTENDOS.PRG, UNIDRIVE.DOS & UNI_BDDS.DOS,
      the program will create a backup copy of the original module (with
      a .BAK extension) and then patch the original copy.  The final
      message should be "All modules patched successfully".  If not,
      please read the error messages carefully; they should indicate
      what the problem is.

  4.  Replace the following files on your distribution diskette with
      the corresponding files from this archive:
        READ.ME
        TRACE.TTP

  5.  (Optional step) Copy CHECKIT.TOS and CHECKIT.CTL to your ExtenDOS
      distribution diskette, and double-click on CHECKIT.TOS.  It will
      perform a simple checksum verification on each of the files you
      updated/replaced in steps 3 & 4 above.  If you get any messages
      indicating that a module failed to verify, it's probable that
      your newly-updated copy of ExtenDOS is invalid.  Try obtaining
      another copy of this archive and redoing the update.  Alternatively,
      you can order an updated copy from Anodyne Software: please see
      below under "If you get an error message" for how to order.

  6.  Once you have finished updating your distribution diskette,
      make a backup copy of this newer version.

  ** VERY IMPORTANT STEP, READ CAREFULLY **

  7.  To install this version on your system, you MUST replace the
      following files in your system with the corresponding files from
      the newly updated disk:

        CD.BOS
        EXTENDOS.PRG
        TRACE.TTP
        UNIDRIVE.DOS
        UNI_BDDS.DOS
      
  8.  Please take the time to read the new READ.ME file carefully.
      It contains information about all the new features of ExtenDOS
      v1.21, particularly photoCD support.


If you get an error message
===========================

  If you get an error message during the patch process and cannot
  resolve the problem, you can mail us the diskette so that we can
  update it.

  To have your diskette updated by us, you need to:

  1.  Send in your original ExtenDOS distribution diskette.
  2.  Enclose a cheque for $5 + $2 shipping & handling ($7 total).
  3.  Enclose a note with your name, address, and daytime phone number.

  In return you will receive a diskette containing ExtenDOS v1.21.


Changes for v1.21
=================

Please refer to the READ.ME file for a summary of changes in v1.21.