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Old 03-24-2005, 05:32 PM   #1
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Need help with tn5250. New to Linux.

Hello all ..

I'm totally new to linux. My company is looking for low-cost solution for adding workstations to our network and be able to connect to the AS/400. I've been tasked with getting it done and obviously linux would seem to be the best option. I am working on the test machine which is a 400mhz pent III pc with 128mb RAM. I have installed the latest stable release of Fedora Core without issue. I am running the tn5250 emulator packaged with it an am able to connect with no problems. The problem I am running into is that, although I have no trouble connecting to the AS/400 or to the internet i am getting less than desirable performance. The machine is of course very low end but once it is up and running and Firefox or tn5250 are started I get sketchy performance. for a couple of minutes I will have no problem and fly through screens or webpages and then everything will slow to a crawl for a few seconds to a minute maybe then work again fine for a few ... etc. If this were a windows PC i'm sure I could isolate the problem quickly enough but i don't even know where to begin with linux. I have already tried re-installing, the second time with a more minimalistic approach to which packages i installed and I still have the problem. I have a windows box running Mocha sitting right next to it and it doesn't have any problems. Any have a clue? The NIC is LNE100TX.

Also .. in the interest of being lazy ... j/k really just thought i'd save myself a bit of time in case someone else has 1rst hand knowledge or know of a really accurate resource about remapping the keyboard for version 0.16.5 of tn5250.

Thx so much in advance for any help,

Old 03-24-2005, 05:48 PM   #2
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A default install of Fedora Core 3 could be very heavy for that hardware. Not that it won't run or cause errors, but the X windows system (either Gnome or KDE most likely) will sorely tax 400 Mhz with 128 ram. If you were to install a different desktop enviornment, say fluxbox, windowmaker or any of the lighterweight ones, you may see an much improved machine.

I have a p2 300 Mhz with 128 ram running slackware 10.1 with flux, and it feels fine, not at all sluggish. You don't need to change distro (from fedora to slack), but you should get something with less eye candy I think.

Old 04-05-2005, 10:01 PM   #3
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The right place to ask questions about tn5250 is on the tn5250 mailing list. All of the developers are on that list as well as many other helpful users. Get on the list by visiting and selecting the linux5250 list.

As for the slowdowns, I can pretty much guarantee it isn't tn5250. I should know - I'm one of the developers!

You may find the tn5250 HOWTO useful as well. Grab it from
There are some example keymaps in there. IF you have any questions about the HOWTO, just ask me since I wrote it.

Finally, you may like x5250 over plain vanilla tn5250. Depending on whether or not you enable the enhanced 5250 protocol x5250 can be quite different from tn5250. x5250 uses the same backend as tn5250 so they have the same feature set. x5250 does have some nice things that tn5250 doesn't. Of course I may be somewhat biased in favor of x5250 since I wrote that too. Check it out at

p.s. - please do get on the mailing list and let us know how your project works out for. Many of us are interested in hearing about how linux and tn5250 have been implemented in various places around the world. If it works out for you it would be nice to know about it as others can use your experience to guide their own installations.


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