English: Photo of old w:analog computer used for solving differential equations in real time. It was programmed by electrical wires connecting summation point operational amplifiers. The front panel can be removed and replaced with another panel programmed with another problem to be solved. These type units were in use around 1965 to 1970 and were manufactured by Electronic Associates, Inc. (EAI).
Exhibit in the National Cryptologic Museum, Fort Meade, Maryland, USA. All items in this museum are unclassified; items created by the United States Government are not subject to copyright restrictions.