Tektronix decided to enter the terminal market themselves, introducing the 4002 in 1969, and the updated 4002A in 1971. The latter sold for $9,400 in 1973 ($ in ), and required a $150 host adaptor. These were similar to the earlier third-party terminals, essentially combining one of their storage tubes with the circuitry needed to decode instructions from the host and turn those into control inputs. However, the 4002 had the unique feature that only a portion of the screen was a storage tube, with a small section set aside for normal refresh-based drawing. This area was used for status messages and entering commands. As they did not include raster scan hardware or any form of memory, refreshing this area rapidly enough to reduce flicker was up to the host computer.