I picked up a Omrom programmable terminal. Picked up is the operative
 word as the thing weights around 70 pounds!
 It appears to work in spite of a disjointed space bar (fixed) and the
 model number is 8030.
 There is a rotary knob on the back that sets the baudrate (up to a
 whopping 4800 baud) and what appears to be 4 rs-232 ports, one parallel
 port and a coax port labeled TV ?? 
My guess is that the last socket is a composite video output (it's unlike
to be modulated RF, but it could be) for feeding an external monitor.
-tony