IMLAC Corporation was an American electronics company in Needham, Massachusetts, that manufactured graphical display systems, mainly the PDS-1 and PDS-4, in the late 1960s and 1970s.
The PDS-1 debuted in late 1969 at that year's Fall Joint Computer Conference. It was the first low-cost commercial realization of a highly interactive computer graphics display with motion. The PDS-1's initial selling price was $9450 for single units, and down to $6545 per unit in larger quantities. The PDS-1 was functionally similar to the much bigger IBM 2250, which cost 30 times more. It was a significant step forward towards computer workstations and modern displays.