this machine far more popular than the original DATA/620.

Varian 620/f

The 620/f shipped in November 1970. By using 7400 Series integrated circuits, including the 74181 arithmetic-logic unit, the 620/f achieved a faster machine cycle time of 750 nanoseconds.

A lower cost 520/i shipped in October 1968.

Varian 620/L

The 620/L-100 was released in 1973. It had a cycle time of 950 nanoseconds

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