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- Using DSZ for Zmodem with ProComm Plus
-
- The authors of ProComm Plus have chosen to provide minimal
- documentation with the "test drive" version of their program. I
- think that's an unfortunate decision, but will leave further
- discussion of that to another time and place.
-
- While I would not normally supplement "crippled" documenta-
- tion -- I'd prefer to let the authors succeed or fail based on
- their own decisions -- as a BBS sysop, I have some interest in
- helping callers to my board learn to use Zmodem. It is, I
- believe, far and away the fastest and most reliable software
- protocol currently available.
-
- With that out of the way, here are some tips on adding
- Zmodem to ProComm Plus Test Drive v1.0.
-
-
- Setting up ProComm
-
- One of ProComm's setup options allows you to define external
- protocols. Go to that option, and do the following:
-
- (1) Define external download protocol 1 as ZMODEM-D.
-
- (2) Define external upload protocol 1 as ZMODEM-U.
-
- You're almost done (see, this isn't so hard).
-
-
- THE BASICS
-
- In this archive are 2 batch files, ZMODEM-D.BAT (for
- downloading) and ZMODEM-U.BAT (for uploading). Put those 2 batch
- files in any subdirectory that is in your PATH. Also place a
- copy of Chuck Forsberg's DSZ.COM in a subdirectory that is in
- your PATH. It's DSZ that's going to be doing the real work here
- (thank you, Chuck).
-
- Now fire up ProComm and call your favorite BBS that supports
- Zmodem. Tell it the file(s) you want to download and then hit
- PG-DN (ProComm's command to receive files). Choose Zmodem-D as
- your protocol. ProComm will then ask you if you want to pass any
- parameters to the program. You don't! On Zmodem receives, DSZ
- gets the names of the files it is receiving from the sender. So,
- you just hit ENTER and watch Forsberg's wonderful DSZ program do
- its thing.
-
- To upload one or more files, hit PG-UP in ProComm and choose
- ZMODEM-U as your protocol. Now, when ProComm asks you what
- parameters to pass, you do have something to tell it -- the names
- of the files you are sending. So, for example, you'd type
- FIRST.ARC SECOND.ARC THIRD.ARC etc. to upload 3 files in a batch.
- You can also use wildcards (e.g., PCPLUS*.ARC to send all files
- that match that file specification). If the files are not in
- your current directory, you can add full pathnames (e.g.
- C:\UP\FIRST.ARC D:\DOWN\SECOND.ARC etc.). See below for more
- tips on paths.
-
-
- COM1 versus COM2
-
- The supplied batch files assume you are using COM1. DSZ
- defaults to COM1. If your modem is on COM2, you could add a 'port
- 2' statement to these batch files. But, a better way to do it is
- to put SET DSZPORT=2 in your AUTOEXEC.BAT file. Then, DSZ will
- use COM2 by default and you won't have to worry about this
- anymore.
-
-
- Baud Rate
-
- Forget it. DSZ is a very smart program. It will detect
- your current baud rate and use it. You don't need a 'speed'
- command.
-
-
- Download Subdirectory
-
- ProComm allows you to define a subdirectory into which all
- your downloads will go. But, when you are using external
- protocols like Zmodem, that specification won't be observed.
- There's an easy fix for that. Edit the ZMODEM-D.BAT file to tell
- DSZ your download subdirectory. So, for example, if you want all
- your files to go to the \DOWN subdir on your C: drive, your DSZ
- receive command would be:
-
- DSZ rz c:\down
-
-
- Upload Subdirectory
-
- Well, this one's a little trickier. You have 3 options: (1)
- Specify the full pathname of each file you are uploading if it is
- not in your current directory; (2) Before starting the upload,
- change subdirectories *within ProComm* to where the files you
- want to upload are located; or (2) If your uploads are always
- going to come from a certain subdirectory, put some ChDir
- commands in ZMODEM-U.BAT. Say your ProComm files are in
- C:\PROPLUS and you keep the files you're going to upload in
- C:\UP, then your ZMODEM-U.BAT file might look as follows:
-
- CD \UP
- DSZ sz %1 %2 %3 %4 %5
- CD C:\PROPLUS
-
- There are some other, fancier ways to skin this particular cat.
- I'll leave those to others.
-
-
- Resume of Aborted Downloads
-
- Part of the "magic" of the Zmodem protocol is that it can
- resume an aborted download right where it left off. If you just
- downloaded 180K of a 200K archive before carrier dropped on you,
- don't despair -- Zmodem to the rescue. All you need to do is add
- a '-r' to your regular DSZ receive command line and the download
- will start up right where you left off (some BBS systems,
- including mine, have taken care of this for you by adding a '-r'
- to the send command line). So, your receive command line would
- simply be:
-
- DSZ rz -r (case is important!)
-
- There's no harm in having the -r in your command line even when
- you are not resuming an aborted download, so I have done it that
- way in the sample ZMODEM-D.BAT file.
-
-
- DSZ Disk I/O Buffering
-
- We're getting into advanced stuff here, but quickly: DSZ.COM
- (NOT DSZ.EXE) has a user-definable disk read/write buffer. It
- will be 1K by default. The buffer can be as large as 8K (8192
- bytes). Here are sample command lines using 4K as an example:
-
- DSZ pB4096 rz
-
- DSZ pB4096 sz %1 %2 %3 %4 %5
-
- That 'B' must be in uppercase. And, 'rz' and 'sz' must be in
- lowercase (that's true for all of these examples).
-
-
- DSZ Flow Control
-
- And now, we're really into advanced stuff, so VERY briefly:
- If your modem will be talking to your computer at a speed higher
- than it's talking to the remote computer -- as is typical with
- 9600 bps modems and even 2400 bps modems using hardware error
- correction with compression --- then you probably need to add a
- flow control command to your DSZ command lines. Sample command
- lines combining the I/O buffer and flow control would be:
-
- DSZ handshake both pB4096 rz
-
- DSZ handshake both pB4096 sz %1 %2 %3 %4 %5
-
-
- Conclusion
-
- That's more than enough, and maybe too much, to get you
- started using Zmodem with ProComm Plus. I hope you find it these
- suggestions helpful.
-
-
- Prepared 2/13/88
- Robert S. Blacher, Sysop
- Computer Connections PCBoard
- Washington, D.C.
- (202) 547-2008 (2400/1200)
-
-