The team that developed SEAC was organized by Samuel N.

[3] SEAC was demonstrated in April 1950 and was dedicated in June 1950;[4][5][6] it is claimed to be the first fully operational stored-program electronic computer in the US.

The tubes were used for amplification, inversion and storing information in dynamic flip-flops.

The computer's instruction set consisted of only 11 types of instructions: fixed-point addition, subtraction, multiplication, and division; comparison, and input & output.

Weight: 3,000 pounds (1.5 short tons; 1.4 t) (central machine).