The VT-220 was a followup to the VT-100. It had the same screen size (I think they are the same). But it was way smaller. The VT-220 was introduced in 1983. What a difference 5 years made. It also had a video out so you could hook it to your big screen tv I guess. And some, this one included, had the 20ma interface option. It also had a serial printer output. On a DB9 (DE9 for you purists). However this was a different pinout that IBM chose to use on the IBM-AT in 1984. Also the LK-201 keyboard was introduced. It had the function keys on top like modern keyboards. It was perhaps the first to do so. It interfaced to the VT-220 with a modular cord, the same as a telephone handset but heavier gauge wire. It was also used on the PRO 300 series, some Vaxstations and the followups to the VT220. I think the VT-220 defined what we think of as a terminal more so than the VT-100.
This sample was bought from the University of Kentucky and bounced around our lab for years afterwards. It needs a good cleaning.
And we connected but then got disconnected. Should I call tech support?