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1991-04-15
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Chapter 17 Pg 53 DSZ Reference Rev Apr-16-91 Typeset 4-16-91
18. CHANGES
Be sure to save your serial number/password (SNP) card and the putsnp
program you received from Omen to use with future versions of DSZ you
may download!
The current DSZ version is maintained on GEnie (IBM Roundtable), EXEC-PC
BBS, 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.
Name Length Date Time CRC
dsz.com 51756 Crunched 15% 44432 16 Apr 91 0:39a 43ca
dsz.exe 62113 Crunched 19% 50776 16 Apr 91 0:37a 0938
PKZIP -vt 32 bit CRC: 7F3514EA 51756 dsz.com
PKZIP -vt 32 bit CRC: 96D6BDA4 62113 dsz.exe
Your copy of DSZ should show this information as provided by
arc v dsz
or
pkxarc -v dsz
lharc v dsz
ARC, and LHARC use a 16 bit CRC.
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 versions corrupts files under
Chapter 18 Pg 54 DSZ Reference Rev Apr-16-91 Typeset 4-16-91
unusual circumstances. Please delete all instances of the 1/17/89 and
2-02-89 version.
A reminder: the -Z option is effective only when it is given to the
sending program unless both are Omen Technology products revised Jan 22
1990 or later.
If you use PREFIX= or ONAME= with the "sb" or "sz" commands, these
pathnames must be entered in lower case unless the underlying file
system supports upper AND lower case.
A boundary condition bug in the implementation of the rz/sz -rr option
has been corrected. When using the -rr option, both sending and
receiving programs should be a March 8 1990 or later version.
Otherwise, files may be needlessly retransmitted. This problem does not
affect the -r option.
April 16 1991: Operation of "handshake slow" has been enhanced when
receiving with ZMODEM CRC-32 and MobyTurbo(Tm). Users who had
previously found "handshake slow" unable to control "Line Status
Register 02" overrun errors should find the new "handshake slow" more
effective on ZMODEM CRC-32 and MobyTurbo downloads.
DSZ.COM and DSZ.EXE now announce themselves as DSZ.COM and DSZ.EXE.
DSZ.DOC has more discussion of differences between .COM and .EXE flavor.
See the FILES chapter for expanded discussion of DSZ.COM vs DSZ.EXE.
April 4 1991: DSZ now supports 115200 bps on suitable hardware.
DSZ.EXE throughputs of 113000 bps have been achieved with modest
trickery. "Your mileage may vary."
The -I option has been added to the sz command. The -I option causes
new versions (Mar 29 1991 or later) of VMS rz to store files with the
VMS Variable length (mrs=510) binary format. Adding this record format
should prevent VMS Kermit servers from corrupting file contents.
pcAnywhere users: please read the "A" command description carefully!
Feb 28 1991: The instructions for adding DSZ to ProComm Plus have been
updated to include PCP version 2. Datastorm has not licensed ZMODEM-
90(Tm despite allegations that DSZ is now "built in" to ProComm Plus
version 2.
The F command was added to leave the 16550A FIFO enabled on exit. The
speed command now updates the effective baudrate used for time
estimates.
sz -e is more network friendly. (If you don't know what sz -e does, you
don't want to know - trust me.)
Chapter 18 Pg 55 DSZ Reference Rev Apr-16-91 Typeset 4-16-91
Dec 16 1990: Code changes to improve operation with the Intel
SatisFAXtion(Tm) modem/fax board.
Nov 19 1990: A number of small enhancements.
The sz -i and -u options were added. The -i option is useful sending
files to VMS rz version 4.x, forcing VMS Stream_LF record format. The
-u option unlinks (deletes) a file after it is successfully sent with
ZMODEM.
SlugBait has been fixed.
The Y numeric parameter (described above) has been added to allow FIFO
hackers to do their thing.
June 25 1990: When a ZMODEM block length is forced, the receiving DSZ
writes the data to disk before acknowledging the block. With DSZ.EXE
and its maximum 16384 buffer size, you may be able to avoid overrun
(Line Status Register 02) problems receiving to slow disk drives by
using:
dsz pB16384 z pl16384 rz
ZMODEM-90(TM) speeds up GEnie ZMODEM downloads; see DSZOPT in Chapter 6.
The "sz" command had an undocumented fallback to YMODEM, this has been
removed for reliability reasons.
The SlugBait (-s) option now causes DSZ to return success (0 exit code)
if at least one file is transferred.
April 11 1990: Enhancements for more efficient multitasking under
DESQview and DESQview 386. Code which prevented IRQ conflicts between
COM1/COM3 and COM2/COM4 has been removed to allow use of COM7 and COM8
without interference from DSZ running on COM1 or COM2..
ZIP replaces ARC as the standard download distribution format on new
files.
March 21 1990: DSZ now sends the CANCEL sequence if it runs out of disk
space while receiving a file with ZMODEM.
DSZ now defaults to "handshake both" if the clear to send signal is high
when DSZ selects the comm port regardless of the initial "baud rate".
The P parameter can be set to -1 to disable the FIFO on the Western
Digital WD16550 chip. The WD16550 FIFO has been observed to lose
characters when transmitting at slow baud rates. A more elegant
software solution to this hardware problem may be discovered in the
future.