Beginning in 1962, the Litton AN/ASA27 radar computer indicator carried aboard the Navy’s W2P-1 early warning radar aircraft was the first full scale commercial application of TI Series 51 logic circuits. The SN275 was a custom variation using Texas Instruments’ “master slice” technique. The block with two transistors is the function replaced by the IC. The board with four mounted flat pack units is encapsulated in the blue module.
