But some people still use these things, my job is to build software that talks to them, and I know there are a lot of smart people on FR.
That's going to be important information if you are going to be trying to write software to it.
What language are you writting in?
I'll take a look around and see what I can find on the TN, if it has similarities to the AP3 system and you are writting the code in COBOL I may be able to help out a little.