Electronic Associates Inc. Model 680 Scientific Computing System

UvA Computer Museum catalogue nr 93.56

Our EAI 680 has been part of a hybrid system; unfortunately the digital part has not survived. Nevertheless the 680 is a complete analog system equipped with The results of the computations can be displayed on a plotter or on a large screen oscilloscope (not shown; we don't have the original EAI units).
Our 680 machine, dating from 1968, is fully functional. The picture below shows the machine while solving the differential equation of a damped pendulum.
pendulum graph