Eniac was the first instance of what? maglev trains gps devices robotics electronic computers

ENIAC was an electronic computer.

Explanation:

Electronic Numerical Integrator and Computer (ENIAC) was the first large-scale electronic digital computer. Many comment that the first one was the Mark I, but this was only electromechanical. ENIAC began operating in February 1946 at the hands of American scientists John Eckert and John Mauchly of Electronic Control Company

The ENIAC began to be developed in 1943 during World War II to compute tactical trajectories that required substantial knowledge in mathematics but only became operational after the end of the war.