High Quality Content by WIKIPEDIA articles! The Tektronix 4000 series was a family of text and graphics computer terminals based on the company`s storage tube technology. No additional electronics were needed to maintain the display, so the 4000 series were less expensive than earlier graphics terminals and became widely used in the CAD market in the 1970s and 80s. They remained popular until the introduction of inexpensive graphics workstations in the 1980s, which used raster displays and inexpensive screen buffers in place of custom hardware. There were several members of the family introduced through the 1970s, the best known being the 4010, 4014, 4100 and 4200.