Tektronix 9200T is 4105, 9201T is 4205; 4205 docs?

OK, so I think I have figured out these "9200T" and "9201T" terminals. The 9200T has exactly the same case and internal circuits as the 4105 with a different set of ROMs from the 4105. However, as near as I can tell, the only difference in the ROMs is that the 9200T reports 9200 as the terminal type in setup. The 9201T has a slightly different enclosure and logic boards. Its setup reports the terminal type as 4205, ROM version 10 Level 9. This is obviously an enhanced ROM with what appears to be support for a larger graphics feature set, including local 2D segments. The keyboards on both are slightly different, with some of the keycaps changed in the function key row (setup and dialog are different than on the 4105) and a mouse port on the back of the keyboard. The connector is also different, an RJ type jack instead of a large 9-pin DIN style. So now I'm looking for documentation on the 4205 terminals. There's nothing on manx or bitsavers. -- "The Direct3D Graphics Pipeline"-- code samples, sample chapter, FAQ: <http://www.xmission.com/~legalize/book/> Pilgrimage: Utah's annual demoparty <http://pilgrimage.scene.org>