The Imlac PDS-1 and PDS-4 were popular graphical display systems in the 1970s. They were made by Imlac Corporation, a small company in Needham, Massachusetts. The PDS-1 debuted in 1970. It was the first low-cost commercial realization of Ivan Sutherland's Sketchpad system of a highly interactive computer graphics display with motion. Only $8300 before options, the cost of four Volkswagen Beetles. The PDS-1 was functionally similar to the huge IBM 2250 costing 30 times more. It was a significant step towards computer workstations and modern displays.
The PDS-1 consisted of a CRT monitor, keyboard, light pen, and control panel on a small desk with most electronic logic in the desk pedestal. The electronics included a simple 16-bit minicomputer, and 8-16 kilobytes of magnetic core memory, and a display processor for driving CRT beam movements.
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