1st of all I don't know anything about using a HMI on this plc. I did find thru Google there were some cable diagrams that suggested how to connect to a QuickPanel. I think they were sold by GE. Maybe forum member Steve Bailey can confirm this. Yes, I believe these plcs are obsolete now.
Edit:I can't tell which direction you want to go with this, but, if you don't already have this system setup up and running, I would try to completely upgrade to a current platform that already has a working/compatible HMI available.