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- Path: zippy.cais.net!not-for-mail
- From: swank@cais.com (Robert D. Swank)
- Newsgroups: comp.sys.amiga.applications
- Subject: Re: Upload Problem
- Date: 20 Jan 1996 15:42:01 GMT
- Organization: Capital Area Internet Service info@cais.com 703-448-4470
- Message-ID: <4dr2g9$ei0@zippy.cais.net>
- References: <bobcarp.821929245@iquest.net>
- NNTP-Posting-Host: cais.com
- X-Newsreader: TIN [UNIX 1.3 950515BETA PL0]
-
- Bob Carpenter (bobcarp@iquest.net) wrote:
- : I need help! I have an Amiga 3000/25 and a 28.8 baud modem. Don't ask
- : what type it is...I don't know. It just says "FAX MODEM" on it. The
- : manual is even generic! The modem uses the Rockwell chipset. And I
- : did also have this problem with a Supra 14.4 modem. Anyway, here's my
- : problem:
- :
- : I can download at 3000+ cps. When I upload it is a different story. Iget
- : lots of errors and retries. I have tried Terminus, Term, and BaudBandit
- : with the same results. I have tried this modem and a supra. I get the
- : problem on my IPS, the IPS that I used to be on in the Chicago area, two
- : local BBSs. So, I think it is something on MY end....but what? I have
- : CTS/RTS set and not using Xon/Xoff. What else could it be? Oh I am using
- : Zmodem for transfers.
- :
- : Any help would be appreciated.
-
- A little trick about Zmodem I learned while running the National
- Capital Amiga Users Group (NCAUG) BBS: The size of the packets must be
- set to at least the size the sender is tring to send. Check to see if you
- have an environment variable for zmodem or xprzmodem. there may be a
- number in there that looks like M1024.
-
- What happens is, when you are downloading, if you have this number set
- higher, like M2048 and the sender is using a lower default, like M1024
- Your modem/software has allowed plenty of space in its buffer for the
- whole packet before checking and clearing out for the next one. however,
- when you are sending with a larger buffer size, you are filling up his
- buffer and keep sending data before he clears out and gets ready for
- it, with the result that a coupld bits of data are often lost at his end.
-
- Setting the buffer size is a feature that I think was implemented in
- version 3 of ZModem.The reason for this, of course, was to allow faster
- transfers with the new modems, while still allowing compatibility with
- old modems and software. But few people ever got into the docs to figure
- it out.
-
- I solved this problem on our BBS by having two ZModem settings to choos
- from and lots of messages to the users :-)
-
- You don't say which terminal program you are using. It is possible that
- your program does not support the higher transfer rates properly.
-
- I believe TERM allows you to set this value from one of its menus, but
- you can also set up the environment variable manually - there are about a
- dozen settings in mine for various things. Wading through the Zmodem docs
- can be a bit daunting, though.
-
- Sorry if this is a bit cryptic, it's over a year since I stopped running
- the BBS and it was a year before that when I figured this all out. You
- can send me e-mail for more about this, as I seem to get
- erratic feeds of responses here, probably due to not reading every day :-)
-
- Bob
-