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CONTENTS 1. TUTORIAL INTRODUCTION.......................................... 2 2. CALLING DSZ FROM COMM PROGRAMS................................. 3 2.1 USE AN INTERFACE PROGRAM................................ 3 2.2 Ms-Kermit 3.00.......................................... 3 2.3 PROCOMM PLUS............................................ 3 2.4 Qmodem.................................................. 5 2.5 GT POWER 13.00/14.00.................................... 6 2.6 TELIX................................................... 6 2.7 BULLETIN BOARDS......................................... 7 3. DESCRIPTION.................................................... 8 4. COMMANDS....................................................... 10 4.1 List of Commands........................................ 10 4.2 Interrupt Keys.......................................... 16 5. NUMERIC PARAMETERS............................................. 17 6. ENVIRONMENT VARIABLES.......................................... 20 7. EXIT STATUS.................................................... 24 8. EXAMPLES....................................................... 25 9. BACKGROUND OPERATION........................................... 26 9.1 Windows 3............................................... 27 9.2 VM...................................................... 27 10. FLOW CONTROL................................................... 28 11. ERROR MESSAGES................................................. 29 11.1 Got ZRPOS............................................... 30 11.2 Subpacket too Long...................................... 31 11.3 Bad CRC................................................. 31 11.4 Serial Input Error: Line Status Register xx ............ 31 11.5 No Carrier Detect....................................... 33 11.6 Port %d (%X) defective.................................. 33 11.7 COMMAND NOT FOUND....................................... 33 11.8 Out of Environment...................................... 34 12. SLOW TRANSFERS................................................. 35 13. IN CASE OF DIFFICULTY.......................................... 36 13.1 LOCKUPS................................................. 36 13.1.1 Insufficient Memory 36 13.1.2 Environment TOO BIG 36 13.1.3 Bad COM Port Configuration 36 13.1.4 LAN Manager Conflicts 37 13.2 Incorrect Batch Files................................... 38 13.3 Cheap Internal Modems................................... 38 13.4 Commands Entered in Upper Case.......................... 38 13.5 No Carrier Detect....................................... 38 13.6 PKARC 3.6............................................... 39 13.7 DOS 3.x................................................. 39 13.8 Perstor Controllers..................................... 39 13.9 IBM PS/2 Model 50Z...................................... 39 13.10 Brain Damaged UARTS..................................... 40 13.10.1 Everex Internal Modems 41 13.11 Weird Iron.............................................. 41 13.12 Will the real YMODEM please stand up?................... 41 13.13 286 and 386 Extended Memory............................. 41 13.14 Disk Caches............................................. 42 14. ASSOCIATED DOCUMENTS........................................... 43 15. FILES.......................................................... 44 16. Other Omen Technology Products................................. 46 16.1 Professional-YAM COMMS TOOLS............................ 46 16.2 ZCOMM: Industrial Strength COMMS Shareware.............. 46 16.3 ZMODEM Developer's Collection........................... 46 17. FAIR PLAY...................................................... 47 17.1 Sharing DSZ Files....................................... 48 17.2 REGISTRATION............................................ 49 17.3 Files on Registration Disk.............................. 50 17.4 Bulletin Board Registration............................. 51 18. CHANGES........................................................ 53 19. ACKNOWLEDGEMENTS............................................... 61 Chuck Forsberg Omen Technology Inc ABSTRACT ZMODEM-90(TM) - Not just another XMODEM hack DSZ is one of many available programs that implement the ZMODEM file transfer protocol. DSZ's ZMODEM provides advanced file management features including two levels of Intelligent Crash Recovery(TM), and flexible control of selective file transfers. Omen Technology's Professional-YAM Communications Tools also provide security verified command downloading. The ZMODEM file transfer protocol provides reliable file and command transfers with complete END-TO-END data integrity between application programs. DSZ's 32 bit CRC protects against errors that sneak by "error free" modems and even the most advanced networks. ZMODEM safeguards all data and supervisory information with effective error detection. (XMODEM and many recently introduced protocols do not protect vital supervisory data.) ZMODEM rapidly transfers files, particularly with buffered (error correcting) modems, timesharing systems, satellite relays, and wide area packet switched networks. ZMODEM's streaming operation eliminates delays caused by Kermit/XMODEM/YMODEM/JMODEM block acknowledgements. ZMODEM eliminates the classic XMODEM/YMODEM/JMODEM PACKET LENGTH compromises between transfer efficiency and error recovery. ZMODEM's packet length is the entire file. User Friendliness is an important ZMODEM feature. ZMODEM AutoDownloadm (Automatic file Download without user intervention) provides a level of convenience unimaginable to users of traditional protocols. DSZ - a ZMODEM-90(TM), True YMODEM(TM), XMODEM File Transfer Program Omen Technology Inc Omen Technology Incorporated The High Reliability Software 17505-V Northwest Sauvie Island Road Portland Oregon 97231 TeleGodzilla BBS: 503-621-3746 Speed 1200,2400,19200 FAX: 503-621-3735 CompuServe:70007,2304 GEnie:CAF UUCP: ...!tektronix!reed!omen!caf ************************************************************************* There's something special about DSZ registration. With most programs, registration applies only to the current version. DSZ isn't like that. DSZ registration bypasses the shareware announcement and unlocks the advanced features in all past and future versions of DSZ. You don't have to pay and pay again for new versions. Omen's Demand Upgrade(TM) technology allows you to download and activate future DSZ versions without further registration! ************************************************************************* Chapter 1 Pg 2 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 1. TUTORIAL INTRODUCTION If you are just starting out with DSZ, or if you have difficulty getting DSZ to work, please follow the procedure given below. Do not run any TSR or other COMM program. This includes LAN programs. Reboot a clean DOS if necessary. Start with the following command given directly from the DOS prompt: dsz port 1 speed 2400 d t Type it exactly as it appears above; do NOT use upper case. (Change the port number and speed as necessary. Use only COM1 or COM2 for testing.) This connects you to the modem. Dial a bulletin board by typing AT commands to the modem ("ATDP621-3746 <enter>")[1] to make it dial the BBS. Log in as usual. Then, request a ZMODEM download of a file you don't already have. The file will download automatically, you don't have to do anything. This procedure verifies the correct operation of DSZ. __________ 1. If your modem has a non standard setting the ATDT621-3746 command you type to the modem may not echo on the screen. Chapter 2 Pg 3 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 2. CALLING DSZ FROM COMM PROGRAMS It may be necessary to give a SET COMSPEC=A:\COMMAND.COM (change as needed) in your AUTOEXEC.BAT file to allow programs to call DSZ. Note: NO SPACES in the SET command! 2.1 USE AN INTERFACE PROGRAM A number of programs have been written to interface communications programs to DSZ. Programs such as XFER help many users customize DSZ to their tastes. Calling DSZ with these programs require more memory than calling DSZ directly. 2.2 Ms-Kermit 3.00 The "push" command (^[p) in MS-Kermit 3.00 sends an XOFF character to the modem before calling DOS. Using this to activate DSZ's term mode with a "dsz t" command causes most remote hosts to stop. The remote host can be un-wedged by keyboarding XON (Ctrl-Q) from DSZ's terminal mode. 2.3 PROCOMM PLUS It's easy to add DSZ to ProComm Plus. Datastorm has not licensed ZMODEM-90(Tm despite allegations that DSZ is now "built in" to ProComm Plus version 2. Many users of ProComm Plus version 2.x use DSZ to get MobyTurbo(Tm, Intelligent Crash Recovery(Tm, and other ZMODEM-90(Tm features. Make sure the DSZ program is in your search path. If you don't see DSZ announce itself when called from ProComm, DSZ is not in your search path. Here are some handy settings for ProComm Plus. First, you may need to set the DOS environment before running ProComm. Give these commands to DOS before running ProComm: Note: NO SPACES in the SET command! SET DSZPORT=2 (Only needed for COM2) SET DSZLOG=DSZ.LOG (Only if you wish a log file) Chapter 2 Pg 4 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 Then set ProComm's external protocol strings. From terminal mode hit ALT-S, then select the PROTOCOL OPTIONS menu item. From that menu select EXTERNAL PROTOCOL OPTIONS. Then set ProComm's external protocol strings to: A- External protocol 1 upload filename: ZMODEMU B- External protocol 1 download filename: ZMODEMD C- External protocol 2 download filename: ZMODEMMD The following batch files are included in the DSZ zipfile: ZMODEMU.BAT (contains: DSZ sz %1 %2 %3 %4 %5 %6 %7 %8 %9) ZMODEMD.BAT (contains: DSZ rz) ZMODEMDR.BAT (contains: DSZ rz -r) ZMODEMMD.BAT (contains: DSZ rz -mr) ZMODEMAD.BAT (contains: DSZ t) !!!!IMPORTANT USE lower case (small letters) EXCEPT WHERE SHOWN!!!! If using ProcommPlus 2.x, select the ZMODEM PROTOCOL OPTIONS menu and turn off Auto downloading. When sending (uploading) files with ZMODEMU.BAT give the ProComm window the full pathname (c:/foo/bar/file.ext) for *each* file not residing in the current directory. When downloading files with one of the other batch files shown above, Procomm will also prompt for parameters; just hit ENTER. Or, you can enter options such as "-mr" if they are't included in the batch file itself. Once you've got the hang of things the "ProComm way", try the "dsz t" command described above to give you automatic ZMODEM-90(Tm downloads (Look Ma, no keystrokes!!!).. You can also set the editor hot key (ALT-A) or view program hot key (ALT-V) by using the ALT-S "FILE/PATH OPTIONS" menu. The strings for these keys are long enough to store an entire DSZ command line without need for a batch file. COM3 and COM4 on Procomm Plus are non standard; in case of difficulty use COM1 or COM2 or use the portx command. DSZ may not operate properly when called from ProComm if ProComm has files open at the time. A number of reports have been received of problems running DSZ from ProComm Plus because of insufficient memory. Please refer to the subchapter on LOCKUPS. When running under ProComm's Host mode, failure to use the DSZ CON command may cause ProComm to lock up the computer, or at least interfere Chapter 2 Pg 5 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 with file transfers, etc. EXAMPLE: DSZ CON sz %1 A number of third party programs have been developed to provide a congenial interface to DSZ if you have enough memory to spare. The POE, PCALL, DSZ_ZAP, and PROZ programs have been popular in interfacing DSZ to ProComm's editor gateway. These programs are available on many bulletin boards. Hint: the DOS PATH environment variable must include ProComm's directory to allow POE to locate all the POE files,. The POE files should be stored in the ProComm directory. Setting the "PROCOMM" environment variable is insufficient. 2.4 Qmodem Instability in the Qmodem interface may require changes in the batch files depending on which version of Qmodem is used. If you define a protocol with 'Z' as its letter, the latest Qmodem will detect automatic ZMODEM downloads. Defining an external 'Z' protocol disables Qmodem's internal ZMODEM, allowing DSZ to be called. The following is based on a message from Mike Cody, sysop of HomePlate 313-385-9969 3/12/24/96 HST Go into Qinstall and go to frame 3 Directories. Then select External protocols #3 I think. Now you will see a definition area to tell Qmodem the Letter,batchfile combo to use. Now put Z in the letter definition, Zup.bat in the u/l batch zdown.bat in the d/l batch, and Y in the batch protocol. Now save it at the menu with f10 and S. Then go to DOS and create the following batch files in your Qmodem directory... zdown.bat: DSZ port %2 speed %1 rz -rr zmdown.bat: DSZ port %2 speed %1 rz -mrr ((FOR MOBYTURBO!!)) zup.bat: DSZ port %2 speed %1 sz %4 !!!!IMPORTANT USE lower case (small letters) EXCEPT WHERE SHOWN!!!! These are the batch files that will be called by Qmodem. If you did everything right when you hit PGDN or PGUP you will see an external protocol called Z) Zmodem in the box. For an easier time do a search for Chapter 2 Pg 6 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 either External.arc or maybe the string "Qmodem" in the file database as there is a file with several external protocols and batch files available in the Mahoney file section (EXEC-PC BBS). The following batch files for Qmodem are included in the DSZ zipfile: ZDOWN.BAT contains: DSZ port %2 speed %1 rz -rr ZUP.BAT contains: DSZ port %2 speed %1 sz %4 !!!!IMPORTANT USE lower case (small letters) EXCEPT WHERE SHOWN!!!! A variation on the receive batch file: c:elecomqmodem sz.com ha slow est 0 %3 rz -mrr A variation on the send batch file: c:elecomqmodemsz.com ha cts est 0 %3 sz %4 If Qmodem says "unable to allocate swap space": QMODEM 4.2 will swap all but approx. 5K to memory or disk when you shell out to DSZ. Go into QINSTALL and make sure that /O /R Optimum Shell and Disk Shell are both set to ON. For older Qmodem versions (before 4.2) change the %4 in upload scripts to %3. 2.5 GT POWER 13.00/14.00 GT Power version 13/14 includes a YMRX.BAT (YMODEM-g receive) file with an "rz" command. You guessed it, "rz" is for ZMODEM protocol (the z means ZMODEM!). Please change the file to use the correct "rb -g" for YMODEM-g. The files ZMTX.ARC and GT1300.NOT available on many bulletin boards contain useful information for GT Power users. 2.6 TELIX Telix has an internal ZMODEM, but some users prefer to use DSZ for performance and/or reliability reasons. Mat Fisher has published a Telix script to call DSZ for automatic downloads. For those of you who use DSZ with Telix, here is a sample script file to use instead of batch files: ////////////////////////////////////////////////////////////////////////// //Protocol salt file for Telix's external protocols by Matt Fisher //Last edited (02/24/90) //used for the DSZ ZMODEM protocol. (It will work for u/ling and d/ling) ////////////////////////////////////////////////////////////////////////// str upload[80] = Chapter 2 Pg 7 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 "c:elixrotocolDSZ port 1 pW1 pB4096 ha off sz -b -m -rr "; str download[80]= "c:elixrotocolDSZ port 1 pW1 pB4096 ha off rz -b -m -rr "; ////////////////////////////////////////////////////////////////////////// Main () { if (_ext_filespec == "") { strcat(download,_down_dir); dos(download,0); } else { strcat(upload,_up_dir); strcat(upload,_ext_filespec); dos(upload,0); } alarm(1); } //////////////////////// THE END ///////////////////////////////////////// Simple but effective... --- TAGMAIL v2.20 * Origin: CRIMP/John Galt [Node 1] (1:120/144) -- INTERNET: Matt.Fisher@f144.n120.z1.FIDONET.ORG NOTE: The DSZ command strings given above are quite unusual. Instead of the "pW1 pB4096 ha off" one would be more likely to use "ha on" or "ha sw" depending on the modem's flow control settings. 2.7 BULLETIN BOARDS When installing DSZ on a bulletin board or host system, be sure to check for proper operation when the caller hangs up while a file is being sent or received. Currently, Only the TurboC version supports file sharing (shared read access on files sent by dsz). Some bulletin board interface routines do not call DSZ to send a file until they have verified the file's presence by opening the file. If this checking is done in DOS's default exclusive open mode, dsz's file sharing will be defeated. Chapter 3 Pg 8 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 3. DESCRIPTION DSZ is a "protocol driver" that uses ZMODEM-90(TM), True YMODEM(TM), or XMODEM to transfer files over a serial port with a variety of programs. DSZ has two main commands for ZMODEM transfers: "sz" sends file(s), and "rz" receives them. When calling bulletin boards to download files with ZMODEM you can avoid the bother of starting DSZ for each transfer by calling DSZ first, before asking the BBS for the download. dsz t The "t" command allows you to keyboard the file request directly to the BBS. (The "t" stands for "terminal emulation".) Just give the "dsz t" command from DOS or your comms program's DOS GATEWAY. DSZ's ZMODEM AutoDownload then receives the file automatically, using the filename provided by the BBS, without any wasted keystrokes or delay. Try it, you'll like it! (The "t" command is described below.) YMODEM downloads are almost as easy. Use the "t" command as shown above, and hit the F3 key after telling the board to download a file with YMODEM. ZMODEM and True YMODEM(TM) transfers preserve exact file length and modification time. DSZ supports XMODEM-1k (XMODEM with 1024 byte blocks, sometimes mislabeled as ymodem) and CRC-16 with the sx -k and rc commands. DSZ is derived from Omen Technology's "Professional-YAM" high reliability communications tools (also known as PowerCom(TM)) and Omen Technology's ZCOMM User Supported Communications Software. DSZ supports a subset of Pro-YAM's file transfer related commands. This documentation makes extensive references to contemporary editions of the Pro-YAM or ZCOMM manual, and is incomplete without it. (Registered copies include an alternate, copyrighted file.) DSZ is usually called from a communications or bulletin board program. DSZ uses its own modem I/O. The original interrupt vector, UART parity, and interrupt configuration are restored on exit. The original state of the 8259 interrupt mask bit for this vector is also restored on exit. DSZ uses DOS standard output (stdout) for messages. DSZ never writes directly to the screen. DSZ expects its standard output to point to the console, a logging file, or NUL, but never the modem port. If dsz's standard output is redirected to the modem (as with ProComm's Host mode DOS shell), the combination will lock up the computer. When necessary, dsz's standard output can be redirected back to the console device with Chapter 3 Pg 9 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 the CON command. Users of pcAnywhere must use dsz's A command to disable pcAnywhere host mode during file transfers. Chapter 3 Pg 10 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 4. COMMANDS *********************************************************** NOTE WELL Except as noted, all commands and options must be typed in lower case. DO NOT USE UPPER CASE!! Case is significant! *********************************************************** Optional commands or arguments are shown in square brackets []. When used (in any combination), the A, CON, port, speed, handshake, estimate, and d commands must be used in exactly this order. dsz [A] [CON] [F] [port N] [speed S] [handshake XX] [D] [d] [restrict] command 4.1 List of Commands A Suspend pcAnywhere operation during file transfers (available only with DSZ.EXE). The A command is used to avoid lockups caused by pcAnywhere host mode. This command should be given to the DSZ running under pcAnywhere host mode. Effective for PCA version 4. NOTE: A bug in the PCA Version 4 API causes the remote to effectively lock up when DSZ executes the suspend-host command. Currently the main workaround for this bug it to use VT-220 emulation on the pcAnywhere host and remote instead of pcAnywhere4 emulation. Another possibility is to run AWREMOTE under DESQview, set the window to SUSPEND AWREMOTE.EXE, and swap windows to a DOS window from which DSZ, ZCOMM, or Professional-YAM can be run while AWREMOTE.EXE is forced to remain inert. EXAMPLE: C>dsz A sz *.foo Sends files from a pcAnywhere hosted machine to you. Fm: Al de la Torre 1 sending from host to remote type: "dsz A sz filename.ext" ENTER shell to dos on remote machine (ctrl-Rshift) type: "dsz A rz" ENTER 2 sending from remote to host type: "dsz A rz" ENTER shell to dos on remote machine (ctrl-Rshift) type: "dsz A sz filename.ext" ENTER Chapter 4 Pg 11 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 CON Redirect message output to the DOS "CON" (console) device, overriding any previous redirections. This is necessary to avoid lockups caused by ProComm host mode. Most programs do not require this hack. This command is unique to DSZ. F Leave the 16550A UART FIFO enabled on exit. Since DSZ has no way to read the 16550A DMA mode and trigger level bits, these values are not restored. port N select port N (n = 1,2,3,4,5,6,7,8, 10,11,12,13,14,15,16,17,18) Default is port 1 (COM1) or read from the DSZPORT dos environment variable. COM11 to COM18 refer to the COM1 to COM8 ports on the PS/2. ***************************************************************** NOTE Only COM1 and COM2 are standard on all PC compatible computers. Multiple standards exist for COM3 and above, so use only COM1 or COM2 when first installing DSZ. ***************************************************************** DSZ COM3 uses 3E8 and IRQ4. DSZ COM4 uses 2E8 and IRQ3. DSZ COM7 uses 2E8 and IRQ5. DSZ COM8 uses 3E8 and IRQ5. If you wish to use COM3 or COM4 and your computer is not wired according to one of these choices, you MUST use the "portx" command to specify base address and interrupt vector. EXAMPLE: to use COM2: dsz port 2 rz In multitasking operation, accessing a port used by another running program will hang the machine. portx base,irq To select an arbitrary port address and interrupt vector, the portx command must be used instead of the port command. Please refer to DSZBG.DOC (provided on the Registration Diskette) or the Professional-YAM or ZCOMM (ZCOMMDOC.ZIP) manuals for details on this command. EXAMPLE: dsz portx 3e8,4 speed 2400 rz speed S Set the specified speed. This command is rarely needed because DSZ reads the port's current speed by default. Please refer to the FLOW CONTROL, MAIN COMMANDS and SOFTWARE COEXISTENCE chapters in DSZBG.ZOO or the ZCOMM or Pro-YAM manual for important information about the speed command. Chapter 4 Pg 12 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 Please study all the chapters of this document when using speeds above 2400 bps. DSZ supports a maximum speed of 115200. Not all hardware can support that speed without errors. handshake XX Enable one of several choices of hardware handshake. (The default is XOFF/XON software handshake). This command is documented in the ZCOMM or Pro-YAM manual, and in DSZBG.DOC. (The ZCOMM manual is available on all bulletin boards registered for DSZ as ZCOMMDOC.ZIP.) On DSZ the "handshake" command may be abbreviated to "ha". D Disables the modem (drops Data Terminal Ready, DTR) if carrier is lost. This may be used to prevent spurious events (phone ringing) from interfering with the calling bulletin board's recovery from carrier loss. d Disables carrier dropout monitoring, for modems that do not properly drive the "Carrier Detect" input on the PC. If you see a No Carrier Detect message, you need to give the d command. Before using the d command, make sure you have the proper port selected!!! estimate length [speed] Use the specified length and optional specified effective transfer speed for the next receive file to be created. This command must come after any port, speed, or handshake commands. Please refer to DSZBG.ZOO or the ZCOMM User's manual for details. The following makes DSZ calculate file transfer times on the basis of 290 character per second aggregate transfer rate: EXAMPLE: dsz port 2 speed 9600 estimate 0 2900 rz EXAMPLE: dsz port 2 speed 9600 estimate 0 2900 sz bigmama.zip pxN Set a numeric parameter x to N. These parameters are mostly a subset of the Pro-YAM/ZCOMM numeric parameters, and are listed below. They assume their defaults each time DSZ is called. Without an argument, p displays the numeric parameters and their values. EXAMPLE: C>dsz p Chapter 4 Pg 13 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 z pxN Set zmodem numeric parameter x to N. These parameters correspond to the Pro-YAM or ZCOMM "zmodem" parameters and rarely need changing. These parameters assume their defaults each time DSZ is called. Without an argument, z p displays the zmodem numeric parameters and their values. restrict Restrict incoming pathnames (YMODEM/ZMODEM) to the current disk and directory tree, and disallow modification or overwriting of existing files. This command is vital for bulletin boards uploading files. The restrict command causes partially received files to be deleted. When DSZ is restricted, it will refuse to transfer files containing the string autoexec.bat and command.com in upper or lower case. This provides some defense from malicious uploaded files. EXAMPLE: dsz restrict rz t [-T] [-8g] Talk with ZMODEM AutoDownload. The optional -T forces DSZ to exit after it has recognized a ZMODEM AutoDownload(TM) request. The optional -8g (available on registered copies only) enables reception of "BBS (ANSI) graphics" displays. (A video device driver such as ANSI.SYS must be loaded to support some types of graphics.) A small subset of ZCOMM/Pro-YAM term function subcommands are recognized: Keyboard F1 or ALT-X to exit. F3 receives file(s) with True YMODEM(TM), ALT-P toggles parity between the 8n default and 8g (enables ANSI "graphics"). ALT-H toggles two local echo ("Half Duplex") modes; the second displays a newline (CR/LF) when Enter is keyboarded. Keyboarded ASCII characters are sent to the modem. ALT-B sends a break. Characters from the modem print on the screen. A device driver such as ANSI.SYS may be used to recognize escape sequences. DSZ's ZMODEM AutoDownload(TM) detects the start of a ZMODEM file download and accepts the file(s) without operator intervention. Chapter 4 Pg 14 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 rz [-abeEmMnpPrt+YZy] [dir] [file ...] (ZMODEM-90 receive) ** rz [-abenprt+Yy] [dir] [file ...] (ZMODEM receive) ** rb [-abt+y] [dir] [file ...] (YMODEM receive) ** rb -g [-abt+y] [dir] [file ...] (YMODEM-g receive) ** rc [-abt+y] file1 (XMODEM/CRC receive) ro [-abt+y] file1 (XMODEM OverThruster receive) rx [-abt+y] file1 (XMODEM receive) rx -g [-abt+y] file1 (Qmodem-G receive) ** ** Download directory specification and -g ignored w/o registration sz [-abefnprtFYQS+yZ] [-w[N]] [PREFIX=p | ONAME=n] file ...(ZMODEM send) sz [-abeEfmMnpPrtFYQS+yZ] [-w[N]] [PREFIX=p | ONAME=n] file ...(ZMODEM-90 send) Pathnames are separated by spaces. Wildcards are OK. EXAMPLE: dsz port 2 sz -r /tmp/file1 /tmp/file3 *.c The "sz" and "sb" commands exploit DOS's tree structured file system. A directory or disk specifier expands to all files in that directory. EXAMPLE: dsz port 2 sz -r C:srcdir If you use PREFIX= or ONAME= with the "sb" or "sz" commands, these pathnames should be entered in lower case unless the underlying file system supports upper AND lower case. EXAMPLE: dsz port 2 sz -r ONAME=newsrc.c temp.c sb [-ft] [PREFIX=p | ONAME=n] file ... (YMODEM or YMODEM-g send) sb -k [-ft] [PREFIX=p | ONAME=n] file ... (YMODEM-1k or YMODEM-g send) Chapter 4 Pg 15 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 sx [-t] file1 (XMODEM, XMODEM/CRC, Qmodem-G send) sx -k [-t] file1 (XMODEM-1k send) v Verify the serial number by writing a log entry (see DSZLOG). v 1 0 bps 0 cps 0 errors 0 128 s/n 666 The letter "v" indicates a verification entry. The first numeric field is 1 if YMODEM-g is supported. The last field is the serial number. Unregistered copies show a s/n of 0. o Turn off Data Terminal Ready (DTR), terminating ("offing") the connection if the modem responds to DTR. Useful with the "t" command to disconnect afterwards. EXAMPLE: dsz t o LARG Convert ARG to lower case, then parse arg. The meanings of optional arguments to the file transfer commands are described in DSZBG.DOC and the ZCOMM/Pro-YAM manual. The s (SlugBait) option prevents a receiver from receiving a file without accounting for it. Attempts to do so are flagged with a Q status in the log file. This option can cause a transfer that legitimately fails near the end of the file to be reported as Questionable rather than ERROR. SlugBait causes DSZ to return success if at least one file is transferred. Send files may be specified indirectly: dsz sz @C:files.lst sends the files in C:files.lst. This provides another means of bypassing the DOS command line limit. The first letter must be "@" and the third letter must be ":" to distinguish this from an ordinary pathname. Pathnames in the indirection file may be separated by any combination of space(s), tab(s), CR and/or LF. No spaces may appear inside a pathname; "FOO .BAR" won't work. A list of files to send may be built up with a command like: EXAMPLE: dir *.zip > files.tmp This file can be edited to remove unwanted files. Then you send the files with: DSZ sz -m @c:files.tmp Chapter 4 Pg 16 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 4.2 Interrupt Keys Ctrl-Break Terminates the transfer in progress. ALT-N Abruptly terminates (NUKES) the transfer in progress. Ctrl-X Typing a dozen Ctrl-X characters to another ZMODEM program terminates ZMODEM operations. ALT-F Skips the current file in ZMODEM transfers. ALT-B Cancels the current ZMODEM session. Chapter 5 Pg 17 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 5. NUMERIC PARAMETERS DSZ uses the following main numeric parameters, settable with the pxN command. EXAMPLE: C>dsz pQ0 rz -rr ************************************************************************** NOTE: Parameter setting commands such as "pd0" cannot be added to DSZOPT, they must be included in the command line. ************************************************************************** In addition, DSZ uses the Pro-YAM/ZCOMM zmodem numeric parameters described in the Pro-YAM/ZCOMM reference manual (ZCOMMDOC.ZIP) and in DSZBG.DOC. B Set the size of buffer used for disk reads and writes. The default is 1024, 4096 maximum (16384 max on DSZ.EXE). If your copy of DSZ is running on a floppy disk system or a very slow turkey hard disk, a larger value may give better results. Too large a value may exhaust memory, induce receiver timeouts, cause disconnects(!), or generate spurious CRC errors. If performance logging doesn't work, this parameter is too big. EXAMPLE: C>dsz pB4096 sz A:floppy.fil Setting the buffer size may lock out the performance log, DSZFILES, and/or indirect pathname list in DSZ.COM. IF YOU AREN'T BLOODY SURE YOU NEED A BIGGER BUFFER, DON'T USE ONE. Please understand that the B parameter has nothing to do with anything you've heard about 128, 1024 or 8192 byte XMODEM style blocks. Normally, ZMODEM's block size is the entire file. O This parameter controls XMODEM OverThruster(TM). It is described in dszbg.doc. This file is part of the software package sent to paid registrants. P After a "speed" command, if you give a p command (display parameters), the P parameter value will indicate the type of serial I/O UART chip detected. DSZ automatically detects and enables the FIFO on the NS16550A, NS16550AFN, and Intel 82510 chips. EXAMPLE: dsz port 1 speed 19200 p 0 Indicates a standard 8250 or 16450 UART with no special features. Chapter 5 Pg 18 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 1 Indicates an NS16550AN or NS16550AFN with 16 deep receive FIFO. These are the preferred chips. 2 Indicates an Intel 82510 with 3 deep receive FIFO. The sequence "port 1 pP1 speed 19200" bypasses DSZ's verification checks normally performed on the FIFO configuration and may allow defective FIFO logic on certain chips to be used. This incantation is not required for the NS16550AN or NS16550AFN. The sequence "pP-1 speed 2400" should be used with the Western Digital WD16550 chip to disable the non standard FIFO on that chip. The WD16550 FIFO has been observed to lose data when transmitting at 2400 bps and slower speeds. The minimum speed for normal transmit FIFO operation with the WD16C550 may vary with different computers. Q Error code returned to DOS (default 1). (Success always returns 0.) Some programs toss cookies when confronted with certain exit codes. EXAMPLE: dsz pQ-1 sz foo.bar DSZ reports an error if no files have been transferred, even if the command used wasn't supposed to transfer any file(s). R If set to 1, causes partially received files to be deleted. EXAMPLE: DSZ pR1 rz S Timeout in seconds (default 15) waiting for restraint release (XON and/or handshake). W Wait for Enter key before exiting after an error. Effective only on registered copies. Useful when calling DSZ from DESQview, allows the window to close unless there is an error message that should remain visible. EXAMPLE: C>dsz pW1 sz foo.bar Y Control byte for the NS16550AN/NS16550FAN FCR register. If you don't know what the FCR does, don't change this parameter. It has been suggested that a different value (129) may improve multitasking under DESQview when multiple copies of DSZ are active. a Calibrates certain protocol timeouts used with XMODEM and YMODEM transfers (Cybernetic Data Recovery(TM)). This parameter does not Chapter 5 Pg 19 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 affect ZMODEM transfers. The a numeric parameter is automatically set to 2000 for a 4.77 mHz PC or XT, 4000 for a PS2/30, 6000 for an 8 mHz 1ws AT, and 12000 for a PS2/80. If your computer has a speedup card or otherwise runs unusually fast (or slow!) for its type, you may set the a numeric parameter to a value that reflects its speed. EXAMPLE: dsz port 2 pa4000 rb NOTE: Setting this parameter does not suppress the "Unknown Machine Type" message which is displayed before the command line is scanned. d A non zero value (the default) causes incoming files received with ZMODEM and full YMODEM transfers to have their Date set to that sent in the file header. ZMODEM's file management features depend on the transmission of each file's modification date. Files will have the same creation date, even if the two machines are in different time zones. When transferring files to/from a Unix system, creation dates are interpreted according to GMT or Universal Coordinated Time. File dating may be disabled with a pd0 command, which causes files to assume the date and time they were received. NOTE: Backdating file creation times may confuse some backup programs. v Verbose level (debugging output) Negative values inhibit some routine messages. Setting v to 1 or greater causes serialized copies to ring the bell when a transfer is done. EXAMPLE: dsz pv1 port 2 rz z Timezone in minutes behind GMT, used for ZMODEM and True YMODEM file transfers to coordinate the actual date of the file with computers in other time zones. Effective on registered copies. PDT or MST corresponds to 420. This may be preset with the ZONE DOS environment variable. Chapter 6 Pg 20 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 6. ENVIRONMENT VARIABLES The following DOS environment variables may be set to modify DSZ operation. DOS environment variables are set by giving a command to DOS. EXAMPLE: set DSZPORT=2 The following form may be used for arbitrary address/vector combinations: EXAMPLE: set DSZPORT=3e8,4 These DOS "set" commands may be placed in your AUTOEXEC.BAT file or given just before you run your communications program. IMPORTANT! Do not add spaces to these commands!! set DSZPORT = 2 WILL NOT WORK! DIRRX (Registered copies only.) Specifies the directory to receive (download) files. If the sting in DIRRX ends with "/", directory and/or disk designators in the incoming pathname are stripped, and only the stem (name and extension) is used. Otherwise, if an incoming file has an absolute pathname, the incoming pathname is used. EXAMPLE: set DIRRX=C:/modem/download/dsz/ dsz rz -r downloads files to the /modem/download/dsz directory on the C: drive, with ZMODEM Crash Recovery.. EXAMPLE: set DIRRX=B:/ The DOS "set" command defining the receive directory may be placed in your AUTOEXEC.BAT file. Make certain there is enough environment space to hold this value. Confirm this by typing "set" to the DOS prompt and verifying the DIRRX value is listed correctly. DSZFILES May contain a list of up to 9999 pathnames to transmit, with entries separated by spaces. If present, DSZFILES is used in place of a normal command line list of files to send with the sb and sz commands. EXAMPLE: C>set DSZFILES=file1 file2 file3 *.c C>dsz port 2 handshake on sz -rr In practice, this string would be built up by a calling program and Chapter 6 Pg 21 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 passed to DSZ with a "spawnvpe", "execvpe", or similar subroutine call. SEE ALSO: Pathname list specification @C:files.lst DSZLOG log file to receive entries for files sent and received. (Default null). Sample entries: Z 46532 38400 bps 3324 cps 0 errors 66 1024 DSZ.COM 1177 Z 124087 19200 bps 1880 cps 0 errors 6 1024 MXY.TMP 1177 Transfer times are based on the DOS time of day clock and have up to two seconds' uncertainty. As with all protocol throughput reports generated by Omen Technology programs (and contrary to the false claims of some critics), DSZ's throughput figures for ZMODEM, Kermit, and True YMODEM(TM) transfers do not take "credit" for pathname and/or protocol overhead characters. DSZ's throughput reports do not include the time required to send the pathname. This understates the true time required to transfer files, but the time required to send the pathname often depends on the alacrity of the operator, and thus does not always reflect the performance of the protocol itself. Transfers measuring less than one second are reported as having 9999 characters per second throughput. The unlabeled numeric field after the error (retry) count is the number of flow control stoppages encountered sending the file. This number gives an indication of flow control restrictions (overloaded networks, etc.) encountered during the transfer. The last numeric field before the file name is the YMODEM block size or ZMODEM subpacket length used for the last block in the file. The last field is the serial number of the other program, or -1 if this information is not available. The code letter indicates the type of transfer, Z (ZMODEM), S (X/YMODEM), R (X/YMODEM), E (error), or L (transfer terminated by loss of data carrier). WARNING: If DSZ encounters a loss of carrier or other fatal error condition before a file COMMENCES transmission, a log entry may not be made. EXAMPLE: C>set DSZLOG=C:/yam/dszlog IMPORTANT! NO SPACES!! Chapter 6 Pg 22 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 DSZOPT (Registered copies only) String containing default options for DSZ file transfers. Options are optional modifiers to the DSZ sz, rz, sx, rx, sb, rb commands. A T may be appended to the string to force DSZ to exit after it has recognized a ZMODEM AutoDownload(TM) request. An 8g may be appended to the string to make BBS (ANSI) graphics the default for DSZ's t command. The ability to preset these options is especially helpful for controlling ZMODEM automatic downloads from DSZ's t command. EXAMPLE: C>set DSZOPT=r Enables DSZ's Intelligent Crash Recovery(TM) as a default. Let's say you wish ZMODEM crash recovery, and BBS "graphics" for the DSZ term function: C>set DSZOPT=r8g If you're downloading files from GEnie with an MNP modem, the following will speed up your downloads with Genie's ZMODEM-90Tm. (You can recognize ZMODEM-90 on GEnie two ways: 1) MobyTurboTm is used to speed ZIP and ARC downloads, 2) "sz 4.xx" is displayed at the end of transfer. As of this writing, ZMODEM-90 may not be available in all libraries.) Note that (as usual with DSZ) case is significant: the "r" must be lower case, the "W" upper case. C>set DSZOPT=rW16384 WARNING: Do NOT include "ena" or any other commands in the DSZOPT string. With the exception of the "8g" mode, only **options** may be placed in the DSZOPT string! (Options are the letters that modify the sz, rz, sb, etc. commands. In "rz -r", "r" is an option.) Parameters can not be set in DSZOPT. MAXBYTES Maximum number of bytes allowed for transfer. If this number is exceeded, DSZ skips the offending files (ZMODEM) or aborts remaining files in the batch (YMODEM). DSZPORT Default communications port override, default 1. EXAMPLE: C>set DSZPORT=2 IMPORTANT! NO SPACES!! Chapter 6 Pg 23 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 ZONE sets the z numeric parameter to the number of minutes the current local time lags GMT time. PDT or MST corresponds to 420. PST corresponds to 480. EXAMPLE: C>set ZONE=420 Chapter 7 Pg 24 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 7. EXIT STATUS DSZ exits with 0 status for successful transfers, or the value of the Q numeric parameter (default 1) if a file transfer failed, or if no files were transferred. Many languages and "door" programs do not return this information to the calling program. Some languages and "door" programs freak out (hang) on certain non-zero exit values. A batch file that calls DSZ directly may be used to detect the DSZ exit status with the DOS "errorlevel" construct. Please refer to the Q numeric parameter below for more information. DSZ's log file entries may also be examined to determine the success or failure of a file transfer. DSZ commands are an improper subset of Pro-YAM/PowerCom/ZCOMM commands. The file transfer commands are fully described in ZCOMMDOC.ZIP, the ZCOMM User's Manual. Relevant portions of the ZCOMM User's Manual are provided in DSZBG.ZOO, a Copyrighted file included with the DSZ registration disk. You may refer to one of those documents for details on the following commands. Chapter 8 Pg 25 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 8. EXAMPLES dsz sz c:foo.zip (send 1 file with ZMODEM) dsz sz -m c:*.zip (send all .ZIP files with MobyTurbo(TM)) dsz sz f1.c f2.c f3.c (send 3 files with ZMODEM) dsz sz c:foo.* b:*.c (send multiple files with ZMODEM) dsz sz -Z *.lst (send text files with ZMODEM compression) dsz sz -r bigone.zip (CRASH RECOVERY: resume interrupted transfer) dsz rz -r (CRASH RECOVERY: resume interrupted transfer) dsz rz -rr (CRASH RECOVERY with file comparison) dsz handshake both sz yamdemo.zip (Hardware+Software handshake) dsz sz -n *.* (send files that are newer or rx has no copy) dsz sz -Yn *.* (Only send files that are newer than receiver's copy) (Do not send files that do not exist on receiver's disk) dsz rz C:/UPLOADS (receive files to specified directory #) dsz port 2 speed 38400 handshake both restrict rz (Restrict provides protection for BBS's) dsz rz -y prog.zip (ZMODEM, single file pathname override) dsz z pr1 rx foo.dat (XMODEM receive, remove file if error) dsz pO60 ro foo.dat (XMODEM/OverThruster receive, GEnie MNP #) DSZ LRC L-Y NEWPROG.ZIP (generate lower case "rc -y" command) dsz sz foo >debug.dmp (Debugging data dump) dsz sz @C:/bbs/files.lst (Indirect file list) dsz sz -u *.lst (Unlink (Delete) files as they are sent) # Registered copies only Chapter 8 Pg 26 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 9. BACKGROUND OPERATION Three DESQview description files are provided to demonstrate background operation with modest (66 kb window) memory requirements. DSZ uses tight C/ASM code, table driven CRC generators, and buffered receive and transmit for good performance in the background without hogging CPU cycles. On a QIC Labs 8 mHz PC-AT clone, DSZ can download files in the background (3 background clock ticks, 9 foreground clock ticks) with a throughput better than 9600 bps. 2S Prompts for file name(s) and sends them with ZMODEM protocol. File: 2S-PIF.DVP 2T Talks to the modem and allows manual YMODEM (F3) or automatic ZMODEM downloads. File: 2T-PIF.DVP 2A Like 2T, but using Quarterdeck's dvansi.com memory resident ANSI CRT device driver to process ANSI screen codes. File: 2A-PIF.DVP DS.BAT is the batch file used by 2A. These files are written for a port 2 local connection and \TMP directory, but may be modified to suit your requirements using the DESQview CP command. The W numeric allows DESQview to close the window after DSZ finishes, providing a pleasant user interface. Other DVPs, Scripts, and Batch files are available on the DESQView conference on the Sound of Music as DVDSZ20Z.ARC. Please consult the DESQview documentation for instructions on installation procedure for the DVP files. Operation at high speed (above 9600 bps) may require the DESQview "Optimize communications" performance Advanced Setup option. Newer versions of DESQview may require more "common memory" allocation (6-8 k bytes) to operate with DSZ. Some versions of DESQview do not operate properly with DSZ; DESQview 2.0 is known to work, and DESQview 2.25 is reported to have fixed bugs in intermediate versions. On 286 and 386 machines, some DESQview operations involve swapping memory contents with buffers in extended memory. As with extended memory ramdisks and disk caches, this causes errors with high speed communications. The considerations discussed in the "286 and 386 Extended Memory" subchapter apply here. Since this DESQview extended memory swapping is asynchronous with respect to DSZ's file transfers, "handshake slow" doesn't help here. The solution is to force DESQview's memory swaps to use smaller blocks (with interrupts allowed between blocks) and/or use NS16550AN or NS16550AFN chips for the serial interface. If you see funny characters on the screen while a program is loading, Chapter 9 Pg 27 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 you have a conflict between the display adapter and QEMM memory manager which may cause lockups. If so you must explicitly exclude the display adapter's memory with an EXCLUDE clause in QEMM's config.sys entry. *********************************************************** WARNING When running DSZ under a multi tasking system such as DESQview, do not allow two programs to access the same comm port at the same time. At best, such actions will disrupt communications. At worst, your computer will attempt to open a subspace channel to V'ger. Tell DESQview to use the SPECIFIC port number you are using, and not "Y" to the question: "Uses serial Ports (Y, N, 1, 2)" When running a comm program under DESQview or any related multitasking executive, DSZ must be called directly from the comm program, in the same window. DO NOT open a separate window for DSZ unless you were about to power down the computer anyway. *********************************************************** With some communications programs, you can make the call, log in, and then exit (closing the window) without disconnecting the modem. At this time you can fire up DSZ with the "t" command to allow YMODEM or ZMODEM downloads in a small window. Example File: 2A-PIF.DVP Alternatively, you can start DSZ from the DOS prompt, then type "AT" commands to the modem to call the bulletin board. DESQview's "learn" facility may be helpful here. 9.1 Windows 3 Communications programs do not operate well under Windows 3 because Windows does not have true multitasking. 9.2 VM According to Marshall Sutherland, Be sure to set IOPL3 mode to YES. Chapter 10 Pg 28 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 10. FLOW CONTROL If you plan to send files over Telenet (PC-Pursuit), you must refer to the Pro-YAM or ZCOMM Reference manual (in ZCOMMDOC.ZIP) FLOW CONTROL chapter for vital information on flow control considerations necessary for proper operation of ZMODEM and other streaming protocols. Chapter 11 Pg 29 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 11. ERROR MESSAGES COM2 1200 bps Carrier Detect enabled Handshake slow Command line = (commands) This is a normal message displayed to help resolve problems with incorrect batch files. The port number, speed, carrier detect ("enabled" or "DISABLED") and "handshake" indicate the selected mode of operation. DSZ FINISHED! exit code = 0 This is DSZ's normal exit when at least one file has been transferred and no unrecoverable errors have been detected. If an error such as a failed file transfer had been detected, the exit code would be 1, or the value set in the Q numeric parameter. As the message implies, DSZ has done all of its processing, and has return the communications port and vector to its original value before displaying this message. If the computer locks up after this message is displayed, there's something wrong with the program that called DSZ, not with DSZ itself. Unknown Machine Type XX, 'a' parameter preset to 6000 indicates a ROM BIOS that does not follow the IBM specification for identifying the machine type. If your computer causes DSZ to display this message, you may set the a numeric parameter described elsewhere in this document. This message is generated before any commands are read, so do not be alarmed when you "discover" that setting the a parameter doesn't make this message go away. The a parameter does not affect ZMODEM transfers. Please send us a postcard or letter indicating the reported hex value for machine Type, name of the computer, and its speed so we can include that machine type in a future release. Need more memory to run DSZ or Abnormal program termination is displayed by the TurboC startup routine if DSZ is run in too small a memory partition. If you see this message, use a larger memory partition for DSZ or remove some memory resident programs. This message may also appear if the calling program fails to free memory before calling DSZ. No Carrier Detect is displayed when DSZ recognizes a lack of carrier detect signal from the modem. Most support calls concerning "No Carrier Detect" are caused by the user failing to tell DSZ to use the correct port. DSZ does not magically divine the COM port number; if the default COM1 is incorrect, DSZ must be told what port to use with the port command or the DPORT environment variable. No Carrier Detect may also be caused by a line disconnect, defective cable, or incorrect modem strapping. It may be disabled with the d command. Sometimes this is caused by setting the B parameter to too large a value. Chapter 11 Pg 30 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 Garbage Count Exceeded Indicates ZMODEM has not detected a valid start of header in a reasonable number of characters. If DSZ becomes "stuck" on emitting this messages, it is possible the sending program may not be able to recognize and act upon transmission requests (ZROPS headers). The sending program should be corrected. In the meantime, setting a ZMODEM packet length with the "zmodem pl4096" ("l" is the small letter l) command will force the sender to wait for the receivers' progress reports. Permission denied comes from the Microsoft C Library. This is caused by attempts to modify a read only file or directory, or to create a file in a nonexistent directory. A furtive flashing appearance of XOFF or FLOW during ZMODEM or YMODEM-g file sending signifies DSZ is responding to flow control restraint. This is normal operation when buffered modems or packet switched networks are used. ZMODEM's robustness and reliability allow creative users to transfer files over unusual multiple computer lash-ups, causing modem data lights and computer status displays to dance in unfamiliar rhythms. Output FLow Control Restraint RELEASED Indcates DSZ has not received a positive flow control signal (XON and/or CTS as specified by the handshake command) within the timeout specified by the S numeric parameter. This message may appear as the result of line noise. If it appears often, it may indicate improper flow control settings, defective modem and/or cable, or (rarely) too small a value for the S numeric parameter. Not allowed to overwrite %s By default, DSZ will not overwrite an existing file. Use the -y or -n or -r option to overwrite/update existing files. 11.1 Got ZRPOS Got ZRPOS indicates the receiving program has detected a transmission error and has requested retransmission. In other words, ZMODEM is doing its job of detecting and correcting missing and garbled data. If this happens more often than observed line errors would indicate is reasonable, the receiver's error messages must be studied. Line Status Register errors generally indicate a local problem; if the receiver gives "Line Status Register 02" errors the problem lies with the receiver. Otherwise, the sender may have a flow control problem in one of four areas: Chapter 11 Pg 31 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 + Between the sending program and its modem. If using an interface speed higher than the transmission speed, or modem to modem error correction (MNP, LAPB, PEP, etc.), check that the modem and the sending program are configured for the same flow control methods. Omen Technology's software is faster than most other programs, and may expose flow control problems not seen with slower software. + Between the sending modem and the network. Correcting this requires "handshake both" to allow the sending program to honor both hardware (CTS) flow control from the modem and software flow control (XON/XOFF) from the network. + Between parts of the network. + Between the receiving modem and the receiving program. This can happen at high transmission speeds when the receiver has specified a large I/O buffer size with the B numeric parameter. Excessive interrupt latency from extended memory ramdisks or disk caches, and poorly written hard disk drivers also wreak havoc on streaming protocols but do not affect start-stop protocols (XMODEM, etc.). Problems with extended memory disk caches may cause errors at regular intervals; check the receiver's error messages. To work around these problems, give the "handshake slow" command to the receiver. 11.2 Subpacket too Long This error may be caused by flow control problems at the sender (see above). 11.3 Bad CRC This error may be caused by flow control problems at the sender (see above). Byte NNNN retry M: <error message> These messages appear when the protocol has detected an error and is attempting to retransmit the garbled data. These are normal messages. 11.4 Serial Input Error: Line Status Register xx Serial Input Error: Line Status Register HH indicates a hardware problem, slow device driver, TSR program, or other software is disabling interrupts too long for the program to accept incoming data, and some characters are lost. A slow response to folow control also triggers this message. The value of the line status register is displayed in HEX. The Chapter 11 Pg 32 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 following error conditions are OR'ed into the Line Status Register. 01 The Interrupt level circular buffer has been overrun. The remote did not respond to DSZ's XOFF or hardware flow control, and continued to send characters after being told not to. This problem is alleviated by correct modem flow control configuration. 02 An 02 value for the LSR indicates Data Overrun. "Data Overrun" means the computer was not able to respond to an incoming character from the UART (modem) in time to make room for the next incoming character. Data Overruns are caused by poorly designed software (or ROM BIOS "firmware") locking out interrupts for excessive periods. These lockouts prevent the communications program from responding to the incoming characters quickly enough. To correct Data Overruns, you must correct the offending condition(s) to allow the communications program to operate properly. Common causes of excessively long interrupt lockouts ("critical code regions") are disk drivers (BIOS), window managers, disk caches, TSR programs, and EGA/VGA board auto-select. Slowing the CPU to allow games and other time dependent programs to be used can generate excessive interrupt latency. Some BIOS programs are written without regard to their effect on high speed communications. Better versions of the offending BIOS programs may be made available if enough users complain about poor performance. Interrupt latency caused by EGA/VGA board auto-select can be often corrected by disabling the board's Auto-Select. Poorly written disk caches and disk drivers cause interrupt latency that affects streaming protocols (ZMODEM) but not start-stop protocols such as XMODEM, YMODEM, JMODEM, Lynx, etc. The handshake slow command can be used to stop reception during disk transfers. Other chapters in this document give suggestions for working around excessive interrupt latency by using the NS16550AN UART chip. Please refer to the "Brain Damaged UARTS" subchapter. Please try all the suggestions mentioned here before contacting Omen Technology about data overruns. 08 Framing Error generally caused by line noise or an incorrect transmission speed ("baud rate") or format (number of bits). Also Chapter 11 Pg 33 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 caused by some cheap internal modems. Most protocols require 8 bits no parity (-8n) for proper operation. This is set automatically by Omen Technology programs, but other programs may not be so smart. 10 Break Interrupt generally caused by line noise or an incorrect transmission speed ("baud rate") or format (number of bits). Also caused by some cheap internal modems. 18 Framing Error and Break Interrupt (see above) in combination. This error may also be caused by defective 8250 UART chips. Certain internal modem cards have slow 8250 chips that do not operate properly with computers faster than 4.77 mHz. Replacing the 8250 with a NS16550AN is recommended. Please refer to the In Case of Difficulty chapter of this document for solutions. Less commonly encountered DSZ error messages are explained in the Pro- YAM manual. 11.5 No Carrier Detect If you see a No Carrier Detect message, and you haven't lost the connection, you should fix your modem cable or modem settings to allow proper operation of the Carrier Detect signal (CD). A poorer alternative is to give the d command: dsz port 1 speed 2400 d t 11.6 Port %d (%X) defective When DSZ selects a serial port, it performs a quick hardware check to verify the presence and minimal functionality of the 8250 family UART. This message usually means a nonexistent port has been selected. Reports have been received of functional but nonstandard UART chips triggering this message. 11.7 COMMAND NOT FOUND If you see this message, make sure DSZ is in the DOS PATH. Sometimes this error is caused by having too many environment variable strings. Chapter 11 Pg 34 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 11.8 Out of Environment means there is not enough room in the program environment to accept more data. DOS prints this message when it cannot allocate more memory to accommodate a "set" command, such as "set dirrx=c:/downloads/". Try moving the "set" commands to the batch file that calls your comms program, or to your AUTOEXEC.BAT file. To increase environment, use the /E switch. The default is 160 bytes. An example for your CONFIG.SIS file: SHELL=C:COMMAND.COM/E:256 NOTE: Large environments may cause DSZ.COM to lockup. This is less of a problem with DSZ.EXE. Chapter 12 Pg 35 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 12. SLOW TRANSFERS Some users report slower than expected file transfers even when few or no errors are reported. Some possible causes are: If "handshake slow" is used, throughput may suffer. Try one of the other solutions to the "Line Status Register = 02" errors discussed above. When using "handshake slow" it may be possible to increase the modem's interface speed to 19200 bps or faster. Bad phone lines will silently slow MNP modems, sometimes without any error indications. If the modems disconnect fairly often you should suspect marginal phone line conditions that are being hidden by MNP error correction. One of the programs may have set a parameter or option that acts to slow the transfer under certain conditions. Chapter 13 Pg 36 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 13. IN CASE OF DIFFICULTY 13.1 LOCKUPS 13.1.1 Insufficient Memory DSZ complains when it detects insufficient memory to operate. When calling DSZ from another program, there may be ALMOST enough memory for proper operation, but DSZ locks up during a transfer or the calling program freezes after DSZ displays the "DSZ Finished" message. Sometimes there is a message about insufficient memory, sometimes just a lockup and no message. To verify this problem, call CHKDSK from within your comms program (not from DOS!) by defining it as an external protocol. If you use an interface program (Hotkeyz, Prodoor, etc.), you must call CHKDSK from that program, as those programs also reduce the memory available to DSZ. CHKDSK should report at least 64k free memory. If less memory is reported, reduce the size of the COMMS program's capture buffer, or reboot the system with fewer/smaller device drivers and TSR programs. Calling DSZ directly from the comms program instead of from an interface also saves memory. 13.1.2 Environment TOO BIG A large environment may cause DSZ.COM to lockup. The size of the environment (the amount of text you get when you give the DOS "set" command) is subtracted from the data space available to 8086 C programs. This can be a problem with DSZ.COM, whose 8086 tiny model limits code, data, stack, and environment to 64 kb TOTAL. Use DSZ.EXE (compiled with 8086 small model) to alleviate this problem. 13.1.3 Bad COM Port Configuration DSZ is fastidious about which interrupt vectors it takes over. Unlike some programs, DSZ uses only the correct interrupt vector for its interrupt service routine. (This allows multitasking.) DSZ obtains and releases this vector with standard DOS function calls. This allows multi line operation under DESQview and other multitasking systems. Incorrectly configured serial ports that work with programs that pig out both IRQ3 and IRQ4 will lock up with DSZ. If DSZ locks up the machine as soon as it tries to send or receive data, this is usually the fault. Make sure the comm port is strapped correctly; COM1 uses IRQ4, COM2 uses IRQ3. DSZ will lock up if the comm port is not properly set up. In addition, DSZ will not work properly if two devices are connected to the same IRQ line, even when some other programs (that don't use interrupts as intensively) do work normally on the same machine. Chapter 13 Pg 37 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 COM3 and above are not widely standardized. If you have problems with COM3, chances are your "COM3" is non standard. 13.1.4 LAN Manager Conflicts Some Local Area Network (LAN) managers take over comm ports using code that interferes with DSZ. The following hint is from Tom Louvaris, LANtastic Sales/Support - New York. Other LAN mamagers may require similar incantations to keep the LAN manager from messing with DSZ's comm port. Problem: When the lan is running, DSZ intermittantly fails. DSZ starts the transfer by displaying "Ready to send pathname". The receiving system does noting. Eventually, DSZ exits with code 1, and no file is sent. To release one or more Com Ports with LANtastic 3.x, enter the following... Net Queue Halt \Sever-name Comn Note: You must be logged on to "Server-name" with Queue priveleges to Chapter 13 Pg 38 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 enable the operation of this command. 13.2 Incorrect Batch Files Incorrect batch files are the number one source of problems using DSZ for uploads and downloads. Bulletin board programs with convoluted batch file mechanisms exacerbate the problem. DSZ's command line echo was added to assist in correcting defective batch files. You should see a display like: Command line = 'rz ' or Command line = 'port 2 speed 9600 sz foo.baz ' You may have to add a "pause" command at the end of the batch file to allow DSZ's messages to be seen. Another possibility is to turn on the printer with ^P before running DSZ, so DSZ's message can be saved on paper. In general, the Command line display should look like one of the examples in this document or those displayed by DSZ itself. (The Command line display does not include the name of the DSZ program itself.) Try running DSZ by itself, without any batch files or TSR programs, calling it directly from DOS as described above. 13.3 Cheap Internal Modems Numerous trouble reports have been received lately caused by cheap internal modems causing errors on ZMODEM transfers but not XMODEM. A similar problem was experienced in the mid 80's during beta testing of some 2400 bps modems. Perhaps defective LSI chips left over from those days were cloned or recovered from the trash bin. 13.4 Commands Entered in Upper Case Most DSZ commands and options must be entered in lower case (small letters, not big letters). Where the documentation or help screen indicates "rz", you must use "rz" and not "RZ". 13.5 No Carrier Detect If you see a No Carrier Detect message, and you haven't lost the connection, you should fix your modem cable or modem settings to allow proper operation of the Carrier Detect signal (CD). Chapter 13 Pg 39 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 A poorer alternative is to give the d command: dsz port 1 speed 2400 d t 13.6 PKARC 3.6 It has been reported that PK36 grabs some interrupts and doesn't restore them on exit in an attempt to prevent hacks of the program. Since eliminating that particular version and cleaning up memory, high speed transfers even with 8250 UARTS work properly again. The problem with PK 3.6 appears to be most severe if a BBS operator has doorware, etc that accesses the PK programs from a shell of some sort. This info may be helpful to users who are having otherwise inexplicable file transfer problems. Phil Katz has written me that this problem has been corrected in subsequent versions. 13.7 DOS 3.x DOS 3.x systems may need to have a "STACKS = 8,256" line in CONFIG.SYS to prevent antisocial behavior. This is required on the NEC Multispeed, or if certain TSR's are used. 13.8 Perstor Controllers Several reports have been received indicating Perstor disk controllers interfere with data communications. Perstor is reportedly working on a fix. 13.9 IBM PS/2 Model 50Z Early samples of this machine have a design error on the motherboard that causes comms programs to lock up the machine. Replacing the motherboard with a correctly functioning unit from current production corrects the problem. The part number of the replacement PS2/50 Z motherboard is 35F5928. (Information provided by John M. Choma 73047,3566) U.S. IBM has stonewalled on this issue, but in December 1988 agreed to replace the defective motherboards under warranty. Chapter 13 Pg 40 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 13.10 Brain Damaged UARTS Omen Technology has received reports of problems with buggy 8250 type UART integrated circuits in Leading Edge modem boards, serial port interfaces, and computers. The defective chip logic affects high performance software. Replacing the buggy chip with a newer chip (16450 or NS16550AN) corrects the problem. The UM82450 chip in the Zoom 2400HC also appears to cause problems. Zoom Telephonics advises that this problem is limited to their old model. The old model is inentifiable by an external volume control. The NS16550AN is a pin compatible plug in replacement for 8250 and 16450 serial chips. Omen Technology software enables the FIFO buffer in the NS16550AN to prevents loss of data from poorly written device drivers, TSR programs, etc. The NS16550AN has better electrical characteristics than the older UART chips. 386 and fast 286 machines should use the NS16550AN for best results. Omen Technology software has been written to allow time for the older UART chips to operate. However, there is a limit to how much the software can rearrange chip accesses without resorting to performance robbing wait loops. Some other software is not as forgiving of slow chips. Be sure to ask for the NS16550AN. It is VITAL to get the National Semiconductor "AFN" or "AN" chip. Other vendors' chips won't do. Current Western Digital WD16C550 chips do not function properly at low speeds. As of this writing, the National NS16550AN and NS16550FAN are the only plug compatible chips that are known to work. The Hayes ESP board comes with two serial ports with NS16550A devices. The ESP definitions for COM3 and COM4 agree with the industry standard definitions used by Omen Technology. The following information comes from a number of people: "I have located a small dealer in New York who has the cards with or without the 16550. I believe the price is around $50.00. The company is RJK Consulting and the number is 718-968-9167. The gentleman to speak to is a Mr. RJ Kulman. ... I got this information off the "Interlink" BBS system." Fm: Nick Braak [TRICON] 75156,1254 Fry's - 415-770-FRYS. This is a Silicon Valley electronic department store. Jameco Electronics at 415-592-8097 sells National NS16550AN chips mail order (credit card) in small quantities. Unfortunately, we have received a number of reports that their serial i/o card is now supplied with the infamous WD16C550 soldered in, even when ordered with specific instructions to include 16550AN chips. Chapter 13 Pg 41 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 Microprocessors Unlimited, 24000 South Peoria, Beggs, OK. (918) 267- 4961. The price for the chip is $13.50 plus shipping costs. No minimun purchase is required. Consolidated Computers 4 Shoppers Lane Suite 121 Turnersville, NJ 08012 (609)751-9595(voice) (609)751-3843(bbs) (609)751-3840(fax) Arrow Electronics at 800-932-7769 (516-467-1000). Willies Computer Software Company: 800/835-4832. N.B.: Current Western Digital WD16C550 chips do not function properly at low speeds. This has been confirmed with samples received directly from Western Digital. WD is aware of this problem, but has not informed us of a corrected chip. 13.10.1 Everex Internal Modems Numerous reports have been received concerning difficulties with Everex modem cards. Some of these cards contain buggy 8250 chips which are not up to the demands of full duplex streaming protocols such as ZMODEM. Replacing the buggy 8250 chip with a 16450 (or better yet NS16550AN) chip corrects these problems. 13.11 Weird Iron A few machines, some with V20 CPUs, don't like DSZ.COM. We have not been able to repeat this; TeleGodzilla (using a V20) runs DSZ.COM without a hitch. Switching to DSZ.EXE has cleared up the problems on other machines. 13.12 Will the real YMODEM please stand up? Some XMODEM programs claiming to support YMODEM neither send nor accept the YMODEM pathname block. 1024 byte XMODEM is XMODEM-1k, not the YMODEM defined by Ward Christensen in 1985 when he invented the term YMODEM. 1987 and later versions of YMODEM.DOC remind the reader of the official YMODEM definition, which has not changed since YMODEM's coinage in 1985. 13.13 286 and 386 Extended Memory Virtual memory disk caches and ramdisks using 80286 or 80386 extended memory require a kludge hardware reset of the CPU chip to return to the normal "real mode" after accessing extended memory. This interference to the interrupt response time causes lost characters on comm ports, and may be minimized by specifying shorter memory transfers. Chapter 13 Pg 42 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 Switching to a National NS16550AN or NS16550AFN UART chip helps tremendously, allowing transfers at 115200 bps instead of 9600 bps with a standard 8250. Please refer to the subchapter on "Brain Damaged UARTs". The DSZ "handshake slow" command may also help. 13.14 Disk Caches Cache programs often interfere with ZMODEM transfers. In one instance, replacing Microsoft's SMARTDRV.SYS with Multisoft's SUPERPCK.EXE helped. Some cache programs can be turned on and off; try turning it off when running DSZ. Switching to a National NS16550AN or NS16550AFN UART chip helps tremendously, allowing transfers at 115200 bps instead of 9600 bps with a standard 8250. Please refer to the subchapter on "Brain Damaged UARTs". The DSZ "handshake slow" command may also help. Chapter 14 Pg 43 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 14. ASSOCIATED DOCUMENTS Consult the Professional-YAM, PowerCom, or ZCOMM manual chapter "OPTIONS FOR FILE TRANSFERS" for descriptions of the file transfer options. The "FILE TRANSFER BASICS" chapter explains the relative merits of XMODEM, YMODEM, ZMODEM, and other protocols and gives tips on their use. The "MAIN COMMANDS" chapter describes the rb, rx, rc, rz, sb, and sz commands. The "MODEM INTERFACING" and "FLOW CONTROL" chapters contain important information on the use of buffered modems with DSZ. Information on the ZMODEM Inter Application File Transfer Protocol is available in Omen Technology's "ZMODEM DEVELOPER's COLLECTION" ($89.00). Unix, Xenix and VMS C Source code for XMODEM, YMODEM, and ZMODEM transfers to/from Omen Technology Products is included in RZSZ.ZOO.[1] This file includes a Pro-YAM/ZCOMM script to upload a bootstrap file to a Unix system, force its compilation, and (if the compilation is successful) upload the rz/sz source files. __________ 1. Technical support for rzsz is available on a paid consulting basis. Chapter 15 Pg 44 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 15. FILES DSZ.COM, DSZ.DOC, 2A-PIF.DVP, 2S-PIF.DVP, 2T-PIF.DVP, BBS_REG.TXT, DS.BAT, FIX.BAT, MAILER, ZMODEMAD.BAT, ZMODEMD.BAT, ZMODEMDR.BAT, and ZMODEMU.BAT constitute Omen Technology's DSZ.ZIP. These same files are in DSZ.ZOO on the distribution diskette mailed to registered users.[1] 2S-PIF.DVP, 2A-PIF.DVP, DS.BAT, and 2T-PIF.DVP are used with Quarterdeck Office Systems' DESQview multitasking executive for background operation. Their use is described in a previous chapter of this document. ZCOMMDOC.ZIP (manual), ZCOMMEXE.ZIP (programs), ZCOMMHLP.ZIP (help processor and database), make up the ZCOMM communications tools shareware distribution. The ZCOMM files are available on finer bulletin boards. RZSZ.ZOO contains ZMODEM "C" source code for COMPLETE VAX VMS and Unix/Xenix programs licensed for use transferring files to/from licensed Omen Technology products.[2] DSZ.EXE compiled with the Xenix to DOS XC may give moderately higher maximum throughput noticeable on slower machines. Sending from a faster machine to an 8 NHz Exerex 1800 AT with 16550FAN, using "sz -ym D:*.*" where D: contains B17MH.GIF 356542: Program BPS Throughput DSZ.COM 115200 5485 cps DSZ.EXE 115200 8696 cps DSZ.COM 38400 3793 cps DSZ.EXE 38400 3793 cps As one can see, the speed difference is important only with high speeds and slow computers (19-38k on a 4.77 MHz PC, 115k on a slow AT). DSZ.EXE supports ZMODEM over 7 bit paths (E and P options), and specified control character quoting (-Q<string> option). The DSZ.EXE requires somewhat more memory than DSZ.COM. DSZ.EXE does not support file sharing due to brain damage in the Microsoft C library. The __________ 1. DSZ.ZOO is supplied to registrants instead of DSZ.ZIP because not all registrants have copies of unarchiving programs. The registration disk includes a copy of LOOZ, a simple dearchiver for ZOO files. 2. Technical support for rzsz is available on a paid consulting basis. Chapter 15 Pg 45 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 maximum DSZ.EXE I/O buffer size available with the B numeric parameter is 16384. DSZ.EXE is available in DSZEXE.ZOO. ZCOMM and Pro-YAM also run faster than DSZ.COM. DSZBG.ZOO contains DSZBG.DOC. Part of the DSZ registration disk, this file provides background information on the ZCOMM/Pro-YAM commands provided in DSZ. For non-registered users, the same information is available in ZCOMMDOC.ZIP. The ZOO archive format is a machine independent improvement on the PC- DOS specific .ARC format. The ZOO format has been precisely defined, and stable ZOO archivers/dearchivers are available on a wide variety of systems. LOOZ.EXE unpacks .ZOO archives. LOOZ.DOC describes LOOZ.EXE. Be certain to type the arguments to LOOZ in lower case, UPPER CASE WILL NOT WORK. Chapter 16 Pg 46 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 16. Other Omen Technology Products 16.1 Professional-YAM COMMS TOOLS Omen Technology makes Professional-YAM, a comprehensive comms program with unmatched power. Flavors are available for PC-DOS, Unix, Xenix, and OS/2 Protected mode. Unix source code is available under license. 16.2 ZCOMM: Industrial Strength COMMS Shareware ZCOMM is a full featured shareware version with a $40.00 basic registration. Registered DSZ users upgrading to ZCOMM get a free binder! 16.3 ZMODEM Developer's Collection Omen Technology sells the "ZMODEM Developer's Collection" for $89.00. This diskette includes the most recent public domain versions of YMODEM.DOC, ZMODEM.DOC and the Unix/VMS rz/sz C source code for YMODEM and ZMODEM. A set of public domain PC-DOS executable programs are included for convenience. For many developers, this collection affords a significant labor savings in obtaining these materials. Chapter 17 Pg 47 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 17. FAIR PLAY Unlike snazzy menu interfaces, reliable high speed transfer protocols take many hours of testing, often over expensive phone connections, to develop. Two decades of communications experience and protocol testing are distilled in DSZ. DSZ is a user supported program developed and supported by Chuck Forsberg, owner of Omen Technology. Countless hours of work and expen$ive resources went to develop and support DSZ for the myriad environments users use it in. The fact that most of the problems people encounter with DSZ are caused by other software, hardware problems, failure to read the supplied documentation, or pirating has not kept users from seeking and getting help, even if it means calling the author in the middle of his sleep. Beyond this, the world of communications is constantly evolving, and it requires a significant ongoing effort to keep DSZ and its documentation up to date with the current state of the art. Individuals with little knowledge of the dynamic nature of telecommunications (or hidden agendas) have misrepresented the frequency of enhancements to DSZ as a sign that DSZ is "unstable" and unworthy of "serious consideration". If you think such sniping is fair play, you are more than welcome to use one of the many other protocol programs available, each of which claim to offer speed and reliability comparable to DSZ. Non registered users are welcome to use DSZ for a reasonable evaluation period. "Reasonable" means "until you've decided whether the program is worth $20.00". It does not mean "until some competing program gets around to adding ZMODEM or True Ymodem(TM)". Once you've evaluated DSZ, ethical use of DSZ requires registering the copy. DSZ is not and never has been Public Domain. Every version of DSZ has included a Copyright Notice and a prohibition against sale or modification. There is no usage counter or other Trojan Horse in DSZ, but if you use this program, you have a moral and ethical obligation to register it. Paid registration enables t -8g, DIRRX, DSZOPT, OverThruster(TM), YMODEM-g, and other advanced features that are present in DSZ.ARC in encrypted form. The registration package serializes and decodes all past and future versions of DSZ.COM and DSZ.EXE. You can get a fully featured upgrade of DSZ simply by downloading a newer version from TeleGodzilla, GEnie (IBM Roundtable), CompuServe, and trusted bulletin boards. Chapter 17 Pg 48 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 17.1 Sharing DSZ Files You are welcome to share unmodified copies of DSZ.ARC or DSZ.ZOO with your friends and associates for their evaluation. This documentation file and the MAILER file must be provided with all copies of DSZ except by prior written permission from Omen Technology Inc. Because of piracy problems, Omen Technology must INSIST that DSZ be distributed only as part of the DSZ.ARC file EXACTLY as provided by Omen Technology Inc, or in an archive which displays a CRC value for DSZ.COM equal to that shown in the Changes chapter. If DSZ.ARC is "zipped" or otherwise repacked, no files may be added to or removed from the archive. If you see an improperly packed or otherwise modified DSZ archive or parts thereof in a bulletin board, please ask the board's operator to replace such files with DSZ.ARC exactly as provided by Omen Technology Inc. Flame them until they behave ethically. No version of DSZ may be sold without the prior written permission of Omen Technology Inc. DSZ is not and never has been Copy Protected. "DSZ unprotect" files have no function whatsoever except to aid and encourage the theft of Omen Technology's Intellectual Property. Distribution or use of programs or procedures that modify, patch, disassemble, decompile, or otherwise reverse engineer DSZ without the prior written permission by Omen Technology Inc is a bloody theft of intellectual property and services and is a violation of Federal Copyright Law. The same applies to debug scripts and documentation written for the same purposes. These perform the same function as pirate satellite and/or cable descramblers, to obtain benefit from encrypted communications without proper payment. Piracy has been investigated by the FBI and prosecuted under federal statutes. Applicable law provides for damages and recovery of attorney's fees. 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. So far, none of the slime producing such bilge have seen fit to sign their real name and address to their cretinous attempts at ego gratification. Distribution of DSZ in any medium without this documentation file is an unauthorized modification to DSZ that deprives the rightful author of registration revenues. That is a theft of intellectual property. Such distribution damages the author by forcing the user and author to waste time and phone bills scrounging for the documentation, and answering questions that are fully covered in the documentation. If any version of DSZ is distributed with any other product, software or hardware, the product documentation must clearly and prominently state that the customer's continued use of DSZ requires registration directly with Omen Technology or its duly authorized agent(s). When unregistered Chapter 17 Pg 49 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 copies of DSZ are distributed on disk, a contemporary copy of ZCOMMDOC.ARC should be included on the same disk. Thank you for your support. 17.2 REGISTRATION After a short evaluation period, ethical users must register their copy of DSZ with a check for $20.00 in U.S. funds sent to: Omen Technology Inc. P.O. Box 4681 Portland, OR 97208 The address on your check is sufficient, no need to fill out forms. For VISA/MC Registrations, you can also: Call VOICE: 503-621-3406 Or register online: 503-621-3746 300-1200-2400 bps Or FAX the INSTANT MAILER to: 503-621-3735 Don't bother scrounging for an envelope, just print the INSTANT MAILER included in this archive! Overseas registrations are sent out International Air Mail. Users, especially those overseas, may choose to register their copy of DSZ for $25.00 U.S. by providing their VISA or Mastercard card number with expiration date and their name as it appears on their credit card. Purchase orders for less than $150 must be prepaid. Omen Technology Inc Federal TAX ID #: 930858776 Oregon TAX ID #: 536565 .ne 12 "Das Recht zur Benutzung von DSZ in Deutschland, Oesterreich und der Schweiz erwerben Sie durch Bezahlung der Lizenzgebuehr von DM 57,00 (incl. Mwst) an RzK Doris Koepke Bitzenstr. 11 D-5464 Asbach Tel. 02683-4547, FAX 49 2683 4537, Telex 86 3705 rzk d, CIS [70126,1660]. Sie erhalten dann von dort sowohl die neueste Version, als auch Ihren individuellen Software-Key, mit dem Sie auch kuenftige Shareware-Versionen "aufschliessen", also die in der Shareware Version nicht zugnglichen Programmfunktionen nutzbar machen koennen, per Post. Die Benutzung nicht registrierter Versionen stellt einen Verstoss geltenden Rechts dar und wird strafrechtlich verfolgt." Chapter 17 Pg 50 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 ************************************************************************* The user registration package includes a printed serial number password (SNP) card. The registration "care package" diskette contains the latest versions of the DSZ programs, additional user documentation, and the installation program which uses your personal SNP to enable advanced features and bypass the opening advertisement. The registration package unlocks the extra value in all past and future versions of DSZ.COM and DSZ.EXE. ************************************************************************* The unique serial number on the registration card is registered to the user, and is acceptable proof of registration to corporate auditors. The putsnp program inserts your unique DSZ Serial Number Password (SNP) into you copy of DSZ with the following command: putsnp dsz.com Putsnp accepts your SNP and asks appropriate questions before inserting the SNP to enable the extra value in DSZ. Your disk directory entry for DSZ will show the date and time you serialized your copy of DSZ. This does not affect the revision date DSZ announces when DSZ is run. Some TSR programs and device deivers interfere with putsnp. If you have a lockup running putsnp, run it without any device drivers or TSR programs (boot a plain DOS from floppy disk). The only legitimate way to disable the opening advertisement in DSZ is to insert an authorized SNP obtained from Omen Technology into DSZ with the putsnp program. Any other suppression or modification of the opening screen is an illegal, unethical theft of services. 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. Piracy is stealing. 17.3 Files on Registration Disk The following files are currently included on the Registration Disk sent to paid registrants. LOOZ.EXE Program to unpack .ZOO archives. Please note that commands to LOOZ must be given in lower case. "looz x dsz" works, "LOOZ X DSZ" fails. LOOZ.DOC describes LOOZ.EXE. Chapter 17 Pg 51 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 DSZEXE.ZOO Contains DSZ.EXE. To dearchive with looz: looz x dszexe (Note: x must be lower case, X won't work!) Type "looz" without arguments to see the help message. DSZ.ZOO Contains DSZ.COM, this document, DESQview description files, and an instant no-effort registration mailer. To dearchive with looz: looz x dsz (Note: x must be lower case, X won't work!) RZSZ.ZOO contains ZMODEM "C" source code for COMPLETE VAX VMS and Unix/Xenix programs licensed for use transferring files to/from licensed Omen Technology products.[1] To dearchive RZSZ with looz: looz x rzsz (Note: x must be lower case, X won't work!) PUTSNP.EXE Installs your unique registered serial number to enable the extra value in DSZ. DSZBG.DOC (in DSZBG.ZOO) Background information for DSZ, consisting of relevant parts of the ZCOMM User's Manual. To dearchive with looz: looz x dszbg (Note: x must be lower case, X won't work!) 17.4 Bulletin Board Registration Note to the wise BBS operator: be sure you understand the DSZ restrict command and how to use it. Use and/or copying of DSZ by bulletin board sysops and/or systems is allowed according to the following conditions: I agree to feature the ZCOMM files (ZCOMMEXE.ZIP, ZCOMMDOC.ZIP, ZCOMMHLP.ZIP) for downloading, and to announce the availability and features of ZCOMM in any bulletins, help displays, or other displays that mention communications programs. It is my responsibility to __________ 1. Technical support for rzsz is available on a paid consulting basis. Chapter 17 Pg 52 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 maintain reasonably current versions of the ZCOMM files on the BBS shown above. I understand that I am welcome to use DSZ on my bulletin board(s) from the time I sign and mail this document as long as I abide by the conditions above, including featuring the above mentioned ZCOMM files. I shall distribute DSZ.COM only as part of the DSZ.ZIP EXACTLY as provided by Omen Technology Inc, or "zipped" without any file additions, deletions, or modifications. If I distribute DSZEXE.ZOO, I shall also maintain DSZ.ZIP in the same directory since DSZEXE.ZOO references files in DSZ.ZIP. If I see a modified DSZ archive or parts thereof in a file or collection of files (e.g., archive) on a bulletin board, I shall replace such files or archive members with the contents of DSZ.ZIP exactly as provided by Omen Technology Inc. I shall report instances of noncompliance to Omen Technology. I shall not allow any version of dsz to be sold, modified, patched, hacked, disassembled, decompiled, or otherwise reverse engineered without the prior written permission of Omen Technology Inc. I understand that DSZ is not and never has been Copy Protected. I fully understand that "DSZ unprotect" files have no function whatsoever except to aid and encourage the theft of Omen Technology's Intellectual Property. (For this BBS registration, a multi node bulletin board operating from a single, common file system counts as one machine.) The purpose of bulletin board registrations is to support and promote ZCOMM and Professional-YAM by popularizing the ZMODEM protocol and featuring the ZCOMM shareware files available for downloading. BBS registrations must be submitted on the bbs_reg form with signature and date, and must accompany a new paid DSZ or ZCOMM registration. The paid registration that must accompany your BBS registration can be one submitted by one of your board's users. Most boards have many unregistered DSZ users, so getting one of them to register their DSZ should pose no difficulty. Since the paid registration may be from one of your board's users, you can get your BBS registered for free by getting one of your users to register his/her DSZ at the same time. 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. Feb 25 1990: Doco change only. The "R" numeric parameter or the Chapter 18 Pg 56 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 "restrict" command may be used to force partially received files to be deleted. These features have been in DSZ for a long time, but never got into DSZ.DOC. Feb 18 1990: DSZPORT now accepts "portx" style arguments in addition to the traditional decimal number. The -Wn option has been improved. Jan-28-1990: Doco improvements, especially to the "In Case of Difficulty" chapter. BBS registration clarified for those that bother to read it. Qmodem batch files fixed. No change to the DSZ software. Jan-22-1990: ZMODEM-90(TM) extensions: Receiver specified window size: The -Wn option operates similarly to the -wn option. The -Wn option is specified to the receiver, which sends this information to the sender. Pro-YAM, ZCOMM and DSZ versions beginning with Jan 22 1990 support this. Specified extra escaped characters: The "zmtxesc" and "zmrxesc" allow extra characters to be escaped when sending (zmtxesc) or receiving (zmrxesc). Zmtxesc is effective sending to any ZMODEM program. The sz commands in Omen products after Jan 22 1990 except for DSZ.COM recognize incoming "zmrxesc" requests. The zmrxesc and zmtxesc string parameters consist of one or more printing characters corresponding to the control characters to be escaped. To escape NULL: set zmrxesc "@" Since DSZ does not support string parameters, a -Q<string> option unique to DSZ performs the same function as zmrxesc and zmtxesc. If the Q<string> option is used in DSZOPT, it must be last. To escape NULL: dsz sz -Q@ file.ext MobyTurbo(TM): MobyTurbo optimizes throughput on ZIP, ARC, and similar files without sacrificing ZMODEM's famous reliability on noisy lines. MobyTurbo works with standard modems, error correcting modems with hardware flow control, and over paths that support ZMODEM and do not "eat" or otherwise respond to control characters. This includes all paths that support YMODEM-g (or would except for line noise). MobyTurbo can be used for downloads over PC Pursuit if software flow control is not turned on. Activate MobyTurbo with the -m option to one or more of: sz command, rz command, or DSZOPT environment variable. ZMODEM over 7 bit paths: (Not supported in DSZ.COM) A pair of ZMODEM-90 programs with 7-bit support operating over a 7 bit path should detect that fact and switch to one of two 7-bit path compatible encodings. For testing, this can be forced with a "-E" Chapter 18 Pg 57 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 option. Default 7-bit mode is RLE compression and 8th bit quoting similar to Kermit but more efficient because not so many control characters are quoted. Use this default for text files. Rubout and all control characters can be escaped with the -e option. Individual control characters can be escaped with "zmtxesc" and "zmrxesc". Pack-7 instead of quoting is activated with the -P option. (-P has no effect on 8 bit paths.) Pack-7 packs 4 bytes into 5 printing characters. This is more efficient than quoting for files where 25% more 8th bits appear than the number of characters saved by RLE compression. (This statement applies to GIF, ARC, ZOO, and ZIP files. It may or may not apply to other binary file formats, depending on the data.) Pack-7 will match or beat standard Kermit on ZIP files, even when Kermit has use of all 8 bits. SUPK412.ZIP 75136 bytes sent at 2400 bps direct connect from an Everec 1800 AT clone 8mHz/0ws to an 18 mHz Intel 386 motherboard. 8-Bit line cps Protocol/command 156 MS Kermit 3.00 to MS Kermit 3.00 (defaults) 182 MS Kermit 3.00 to MS Kermit 3.00 (windows=2 length=2000) 184 MS Kermit 3.00 to Pro-YAM 17.51 (windows=2 length=2000) 231 Pro-YAM 17.51 ZMODEM (defaults) 237 Pro-YAM 17.51 ZMODEM-90(TM) MobyTurbo(TM) (sz -m) 7-Bit line cps Protocol/command 156 MS Kermit 3.00 to MS Kermit 3.00 (windows=4 length=2000) 190 Pro-YAM 17.51 ZMODEM-90 PACK-7 (sz -EP) Kermit transfers used 8 bit CRC, ZMODEM used 32 bit CRC. ************************************************************************ ************************************************************************ WHAT TO LOOK FOR: Performance difference with MobyTurbo, possible side effects/incompatibilities. MobyTurbo logic tests for software flow control incompatibilities: when does this test fail? Automatic detection of 7-bit paths. Spurious detection of 7-bit paths and failure to detect 7-bit paths. (DSZ.EXE only) 12-13-89 The Virus check was removed because of user confusion and slow startup under certain conditions. Code has been added to prevent and/or Chapter 18 Pg 58 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 recover from "line status register 18" errors. 10-28-89 A T may be appended to DSZOPT or "dsz t -T" may be used to force DSZ to exit after it has recognized a ZMODEM AutoDownload(TM) request. 10-24-89 BBS registered copies (serial numbers 8000-8999 and 20000- 23999) are now fully featured. The BBS registration form has been modified. Please read this form carefully before applying a BBS serial number. Use of BBS serial numbers (4000, 20000 series) acknowledges acceptance of this contract. The IMP/KMD compatibility file length information in the YMODEM header generated by the sb command now uses the correct byte ordering. Changes to the XMODEM/YMODEM sz/sb commands were made to accommodate programs that ise CK or CKL. (As predicted in 1985, networks sometimes interfere with these sequences.) Files passed over because of creation errors at the receiving end are now counted by the "sz" command as errors. The receiving program must be a 9/89 or later version for this to be effective. The specified directory form of the rz and rb commands has been enanced to accommodate certain forms of erroneous syntax. 6-19-89 A documentation error (concerning DSZPORT) was corrected in the DOC file. 5-25-89 Corrects a protocol negotiation problem encountered when the rz or sz -e option is used. Host programs can now specify an alternate CANCEL sequence (not used for DOS and Unix). The ZMODEM "Slow Send" mode inserts a brief pause after each subpacket when invoked with the -F option, or automatically when the "sz" command detects failing flow control. The zmodem F numeric parameter (default 1) sets the pause in tenths of seconds. 4-24-89 The -rr option has been improved. Long file compares are done in two stages to save time when the first portions do not match. Diagnostic code and undocumented commands have been removed to decrease the program size. The 4-18 version introduces ZMODEM variable length headers of up to 16 bytes information field instead of the previous fixed 4. Selection of variable length header capability is automatic and downward compatible. Variable length headers allow future extensions to ZMODEM's capabilities. Chapter 18 Pg 59 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 ZMODEM Crash Recovery now understands the -rr option to compare the CRC-32 of the assumed common file segment before continuing an incomplete file transfer. The "zmodem R" numeric parameter may be set to limit the number of bytes in the files that are compared; the default R value of 0 allows all of the file to be compared, an R value up to 32000 (up to 2 billion on 32 bit flavors) limits the comparison to the first R bytes of the two files. The ZMODEM -rr option is supported by Omen Tech versions April 18 1989 and later. When ZMODEM Crash Recovery detects incompatible source and destination file contents, the destination file is now truncated to zero length before proceeding with the transfer. Crash Recovery requires the destination file to be no longer than the source file. Error reporting on unregistered copies has been enhanced to point the user to solutions described in the relevant chapters in DSZ.DOC. 3-18-89 In order to work around a bug in the new TCOMM bbs, DSZ now defaults to "handshake on" if the speed is greater than 2400 and the clear to send signal is high when DSZ selects the comm port. The "o" command has been added to disconnect the modem after a terminal session: "dsz t o" disconnects the modem when the terminal session is completed. The "P" (capital P) numeric parameter (q.v.) has been added to display and control the UART fifo on some clone chips. BBS registrations postmarked after Feb 28 1989 must be accompanied by a paid DSZ registration. The free program expired Feb 28 1989. Outside help has been hired to process and verify applications received under that program. 2-23-89 The term function now sends BREAK in response to the ALT-B key. Handling of the Ctrl-Break vector has been changed so an untimely keyboarded Ctrl-C or Ctrl-Break will not hang DOS. 2-15-89 DIRRX is enabled for BBS registrations (8xxx numbers). Logic has been added to simulate transmit interrupts on chips that have problems in this area. The "A" command does not require registration. An interaction between ONAME= or PREFIX= and the file count display has been removed. Time/date conversion routines have been enhanced to deal with files with missing dates. The "v" command has been added to allow bbs programs to interrogate DSZ's serial number. 2-06-89 A spurious error message at the completion of YMODEM downloads with a download directory specified on the command line has been eliminated. 2-05-89 DSZ now returns a non 0 status unless at least one file has been transferred. An inappropriate pathname/disk specifier check on Chapter 18 Pg 60 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 specified download directories has been removed. Previous versions: Added the "A" command to prevent pcAnywhere host mode from locking up DSZ. SlugBait logic has been simplified, reporting any failed file transfer where any of the last 1K of the file was sent with Q status. Introduced ZMODEM RLE compression with the -Z option. (registered DSZ copies also accept "Z" in the DSZOPT environment variable.) ZMODEM RLE compression packs runs of the same character in two or three character sequences. Compression is useful for screen dumps, uncompressed workspaces, compiler listings, and other files rich with strings of repeated characters, but not .ARC, .ZOO and other compressed files. Compression percentages range from -1 per cent for already compressed files to more than 1000 per cent (10x speedup!) for the Personal Computing text file benchmark(!). When sending to programs that do not support ZMODEM compression, the -Z option is ignored. The -Z option is effective when specified to the sending program only. Good news for tired frog stompers! The ZMODEM rz/sz programs are now available in a VMS C flavor. The VAX/VMS source files are contained in the RZSZ.ARC (RZSZ.ZOO) archive file. "Handshake slow" has been added to disable the RTS signal to the modem while writing to disk, even if the interrupt buffer is not chock full of bytes. This should help systems with excessive interrupt latency on disk writes. Setting the v (verbose) parameter to 1 or greater causes serialized copies to ring the bell when a transfer is done. DSZ.DOC has been extensively rewritten and reorganized. DSZ supports the advanced buffering of the National NS16550AN, NS16550AFN and Intel 82510 serial interface devices. Please refer to the subchapter on "Brain Damaged UARTs". Chapter 19 Pg 61 DSZ Reference Rev Apr-16-91 Typeset 4-16-91 19. ACKNOWLEDGEMENTS 32 bit CRC code courtesy Gary S. Brown. ZMODEM-90(TM), MobyTurbo(TM), The High Reliability Software(TM), Demand Upgrade(TM), TurboLearn Script Writer(TM), Cybernetic Data Recovery(TM), ZMODEM AutoDownload(TM), Intelligent Crash Recovery(TM), Error Containment(TM), Full Time Capture(TM), True YMODEM(TM), OverThruster(TM), Password Guardian(TM), CryptoScript(TM), and TurboDial(TM) are Omen Technology trademarks. PowerCom was trademarked in 1985 by POLYTRON Corporation, Hillsboro Oregon. True YMODEM(TM) is an Omen Technology Trademark signifying YMODEM protocol support that meets the full YMODEM specification. DSZ and this documentation are Copyright 1990 by Omen Technology Inc, all rights reserved. DSZ is not and never has been Public Domain. Every version of DSZ has included a Copyright Notice and a prohibition against sale or modification. This prohibition applies to any theft of the intellectual property and trade secrets contained in DSZ by decompilation, disassembly, or any other form of reverse engineering including but not limited to profiling, tracing, data analysis, or monitoring the operation of DSZ. Omen Technology copyright applies to its expression of the encoding and compression ideas expressed as code and byte streams used in the ZMODEM-90 enhancements. DSZ is not and never has been Copy Protected. "DSZ unprotect" files have no function whatsoever except to aid and encourage the theft of Omen Technology's Intellectual Property. Omen Technology Incorporated The High Reliability Software 17505-V Northwest Sauvie Island Road Portland Oregon 97231 Modem: 503-621-3746 Speed 1200,2400,19200 FAX: 503-621-3735 CompuServe:70007,2304 GEnie:CAF