Re: Telnet 5250 in Linux or Browser

On 12/11/2009, at 2:46 AM, Pete Helgren wrote:

Could be I am not understanding how the HMC plays here. My understanding would be that tn5250j is installed ON the HMC, just like in Linux, and so the JVM installed on the HMC would be an issue to consider. But, I don't have an HMC and haven't used one for months so I may not be grasping the issue.

I think that's not allowed. HMC is unsupported with anything but the shipped software. Connectivity is from client to host via HMC simply to connect to service ports. I'm not sure of all the details either not having an HMC to experiment with. I do know that console connectivity via PC5250 to HMC is effectively passed through to the target host. The HMC is simply a connexion conduit.

I also know that tn5250j does not implement the full 5250 data stream and even when it implements some of the so-called advanced DDS it does so incorrectly. By that I mean it informs OS/400 that it can handle groups of advanced DDS functions via the 5250 Query Response but then chooses to implement only a subset of those groups (from memory it handles push buttons but not the other features that are implied by setting the bit for that group). Some while ago I did trace the data stream from a tn5250j connexion and it is apparent that the Query Response is simply cloned from a trace of some other emulator-- probably Mochasoft--rather than being set for the capabilities of tn5250j.

I have a bunch of 5250 test-cases that can easily confuse tn5250j and most of the other emulators. PC5250 is the only emulator I know that supports a full implementation and even that does the odd weird thing.

It is this background that makes me suspect the parsing of the 5250 data stream rather than any other cause.

Regards,
Simon Coulter.
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