does have a Rockwell modem board in it.
I did find an old Computerworld ad from 1989 which matched. Informer 213 -
emulating a 3274 control unit with an attached 3178 mod 2 terminal.
Someone with IBM knowledge might share what that means and how the
terminal can be used.
Reading the add it looks like you need a dial-up SDLC (that?s synchronous data) link into
a mainframe with a telecoms controller running VTAM, l which I guess is as rare as hens
teeth these days.
When you get to the set up menu's can you check if it can run bi-sync as that might
be hackable, providing a suitable synchronous modem can be found.
Dave
G4UGM