19.  CHANGES

     Be sure to save your serial number/password (SNP) card and the putsnp
     program you received from Omen Technology to use with future versions of
     DSZ you may download!  (Use GCOLORS to serialize GSZ.)

     Current GSZ and DSZ versions are maintained on EXEC-PC BBS, BIX, GEnie
     (IBM Roundtable), CompuServe (IBMCOM and CONSULT SIGs) as well as
     TeleGodzilla.

     DSZ is a popular program which has been the object of virus attacks.
     Pirated/hacked versions of DSZ have cost users and DSZ's developer
     thousands of dollars in lost time and other expenses, in addition to
     injuring of Omen Technology's reputation.

     Virus and Trojan code hidden in hacked/pirated copies of DSZ and
     programs claiming to "register DSZ" have caused loss of data.


     -rw-r--r--   1 caf      omen       52586 May 03 15:22 dsz.com
     -rwxr-xr-x   1 caf      omen       60251 May 03 15:25 dsz.exe
     PKZIP -vt 32 bit CRC: 0B00125F   52586  dsz.com
     PKZIP -vt 32 bit CRC: BF552B2D   60251  dsz.exe
     -rw-r--r--   1 caf      omen       32864 Apr 26 08:44 gcolors.exe
     -rw-r--r--   1 caf      omen       70352 Apr 27 15:00 gsz.exe
     PKZIP -vt 32 bit CRC: C0990846   70352  gsz.exe
     PKZIP -vt 32 bit CRC: E83AEFB2   32864  gcolors.exe
     Your copy of DSZ should show the same CRC values.  ZIP uses a 32 bit CRC
     compatible with the Professional-YAM and ZCOMM "crc" command.
           pkzip -vt dsz
     The following Pro-YAM/ZCOMM command gives the 32 bit CRC for DSZ.COM:

     EXAMPLE: >>>c: crc dsz.com

     If your copy shows a different CRC or file length, insist on a
     legitimate copy and report the source of the bogus/pirated copy to Omen
     Technology Inc.  Omen Technology has received reports of serious
     problems caused by unauthorized patches to DSZ, and cannot assume
     liability for the performance of the resultant code.


     COM7 and COM8 are changed; see the "port" command above.

     A problem in the 1/17/89 and 2/2/89 DSZ versions corrupts files under
     unusual circumstances.  Please delete all instances of the 1/17/89 and
     2-02-89 version.

     There never was a "zmodem d" parameter in DSZ.  Older versions of DSZ
     ignored attempts to set this nonexistient parameter with a message that





     Chapter 19 Pg 58       DSZ Reference Rev May-3-92         Typeset 5-3-92


     humans ignored.  DSZ now aborts when asked to set a nonexistient
     parameter.  There is a "d" parameter that controls time/date stamping of
     files; Bulletin boards that need to disable time/date stamping of
     received files should simply use "pd0" not preceded by a "z".

     Good news for tired frog stompers!  The ZMODEM rz/sz programs are
     available in native VMS flavors with wild cards, record format support,
     etc..  Pre compiled VAX/VMS files are contained in the RZSZ.TLB
     compressed text library, available in the TeleGodzilla upgrade/vms
     subdirectory, Compuserve VAXFORUM, GEnie, and other bulletin boards.

     The DSZ and GSZ "t" command uses the DOS console driver for terminal
     emulation.  Standard ANSI.SYS is limited to a small subset of ANSI
     escape sequences; NANSI.SYS, FANSI-Console and other replacement console
     drivers provide faster screen updates and better ANSI terminal
     emulation.

     DESQview users: make sure "Separate Shift State" is set to "N".  (Tnx to
     Tim Trott for this info.)

     May 3 1992: Recompiled to correct bad file size/CRC values in DSZ.DOC
     and DSZNEW, pruned some unused code.  No functional changes from April
     27 vsn.

     April 27 1992: The GSZWINDOW environment variable can be set to 1, 2 or
     3 to leave the top 1, 2 or 3 lines unmolested.  DSZ.EXE is compiled on a
     newer compiler and now supports file sharing.

     Bogus/hacked/infected files with early 1992 revision dates have been
     reported.

     Dec 13 1991: DSZ and GSZ automatically support Doorway 2.2 without extra
     commands.

     The RZ.BAT and SZ.BAT files are supplied for convenience.  RZ.BAT allows
     calling programs that emit an "rz" command to automatically start DSZ
     from the DOS command prompt.  SZ.BAT is a convenient command interface
     that complements RZ.BAT.  You may modify SZ.BAT and RZ.BAT with your
     favorite options.

     The GSZ file transfer display now shows a distinct color at the
     locations where error retries occurred.  This gives a visual impression
     of the distribution of error retries.

     Oct 15 1991:  To accomodate other vendors' programs which do not provide
     a convenient way to control crash recovery, the "restrict" command
     security check is not performed if the destination file does not exist.