🚀 go-pugleaf

This seems like it ought to be a fairly straightforward issue, but I'll admit
that at this point I'm baffled.  

I am using a VT320 terminal to access an application running on our
university's IBM mainframe.  The application accepts VT100 terminal input,
and I have set up the VT320 as a VT100.  The problem arises when the
application (PHOENIX authoring system) needs the keyboard codes generated
by keys labeled PFn and PAn (where "n" is a number).  I am assuming these
are keys labeled as such on a VT100, but I can find no reference in any
of the documentation I have that shows what keys (or key combinations) are
the VT320 (or VT220) equivalents.  

I do have the VT320 set to application keypad, and have tried what would
seem to me the likely keys on the keypad area (since PF1 - PF4 are available
also on the LK201 keyboard, and these seem to have the right effect in
PHOENIX), for example, 7  8  9  -  on the keypad would seem to be logical candidates
for PF5 - PF8, but this is not the case.

Would some kind soul enlighten me?  Thanks in advance.

Dean File
UNC School of Medicine
Chapel Hill