Westinghouse W1642 terminal... any info?

I posted this over at comp.terminals, but I figured I'd send it out to this list too... I've just accquired a Westinghouse W1642 terminal, and I'm looking for any kind of documentation I can find on it. It's clearly somewhat of a single purpose terminal, originally used at airlines. The keyboard is weird, and is missing many "useful" characters, like brackets, slashes, pipe and comma. Instead, it has various weird symbols, command keys, and such. It has no shift key, and only displays upper case. It also appears to support multiple sessions, with keys to switch between them, and display a split screen mode. Typing in any of the sessions will echo to the screen, even with nothing connected. On the back are four female DB25 connectors - LINE/PRINT, PRINT1, PRINT2 and AUX. I've tried connecting it up to a computer and sending text to it, at 9600 baud. Connecting an RS232 cable to AUX causes the CTRL-DOWN indicator at the bottom of the screen to go away, but only for the full screen session. Sending random junk to the terminal through the serial port occasionally is able to bring up a message at the top, something about an invalid printer, but no other garbage displays. So far, I've only tried it at 9600 baud, I didn't have time last night to try other speeds. Inside the terminal seems rather conventional, I haven't dismantled it completely, but near each port is a 75154 (quad line receiver), and it appears that farther back on the board are other comms chips (socketed). I was expecting to see 1488/89 pairs, but haven't seen those in there yet. Two of the ports are on a daughter board, the other two are on the main board. The boards are partially hidden by the monitor chassis, and I've not pulled them out to look yet. There are some dip switches on the main board though. So.. basically, I know that this isn't going to be a great computer terminal, with it's lack of important command keys, (no ESC either!). That's too bad, since it's very well built, has a very nice keyboard, and a very sharp, clear screen. But, I would like to be able to do something with it, send text to it, use it as a console command monitor, something. Does anyone have any kind of documentation or information on this beastie? Thanks! -Ian