If you get the "Sorry, the file cannot be displayed. There seems to be a technical issue ..." error when trying to view an image, a workaround is to click on the cog icon in the upper right side of the media viewer, and then select "Disable Media Viewer". We are aware of the problem and are looking for a solution.
The Tektronix 4002 (aka T4002) was the first graphics terminal offered by Tektronix. It was announced in December 1968 and introduced in 1969.
Alphanumeric capacity is 80 columns × 35 lines. The character generator includes 94 ASCII symbols in two sizes.