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     21.  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 Omen's
     TeleGodzilla (503-621-3746).

     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.



     PKZIP -vt 32 bit CRC: 8F0086D4   53982  dsz.com
     PKZIP -vt 32 bit CRC: 0A1D5AF5   61399  dsz.exe
     PKZIP -vt 32 bit CRC: 0E12A26F   72352  gsz.exe
     PKZIP -vt 32 bit CRC: 5AE73B7E   33040  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 nonexistent parameter with a message that
     humans ignored.  DSZ now aborts when asked to set a nonexistent





     Chapter 21 Pg 65       DSZ Reference Rev Jun-7-95         Typeset 6-7-95


     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 (503-621-3746)
     upgrade/vms subdirectory, Compuserve VAXFORUM, GEnie, and other bulletin
     boards.  FTP access at ftp.cs.pdx.edu pub/zmodem/rzsz.tlb and Simtel20
     mirrors.  (Get RZSZAXP.TLB for Alpha VMS systems.)

     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.)

     Jun 7 1995: Added support for the Texas Insturments TL16C550C ACE with
     AUTO-FLOW control.  This chip is identified as type 4.  GSZ displays
     were optimized.
      -h no longer spazzes.

     Sep 18 1994: Supports the Startech ST16C650 ACE with 32 byte FIFOs and
     on chip hardware flow control support.  This chip is identified as type
     3.

     July 17 1994: GSZ and DSZ now accept extended receiver defined character
     escaping requests which can specify the all ones character FF to be
     escaped.

     April 26 1994: The ZMODEM k, K and J numeric parameters have been added
     to help on machines with old style UARTS encountering LSR 02 serial inut
     errors.

     Feb 25 1994: The Windows multitasking added in the Jan 27 version has
     been modified; it was overly generous.  The subchapter on Windows
     operation has been changed.

     Feb 02 1994: Fixed anomalies with YMODEM-g and time display.  Hardware
     support was revised to accommodate a Hayes ESP board incompatibility
     with the 16550 spec.

     Jan 27 1994:  Added the "G" command to send an XON character to the
     modem.  This is useful when calling dsz from MSKermit as MSKermit sends
     an XOFF character to the modem.  Multitasking on OS/2 and Windows has
     been improved.  Handshake slow is more aggressive in flushing disk
     buffers.