Engineer at operator console of transistorized Litton 20 Computer
Photo Credit: University of Southern California/California Historical Society

The operator's console of the Litton 20 computer. The computer electronics are contained in the cabinet located behind and to the right of the desk that has the operator's console on it.

The Litton 20 was produced by Litton Industries and was introduced in 1956. The logic circuitry is composed entirely of transistors, making it one of the earlier transistorized electronic computing machines. The Litton 20 was not a general-purpose computer, but was developed specifically for the solution of differential equations.