TAF: a steady state, frequency response, and time response simulation program

For over a decade, engineers have used the analog computer to simulate systems, models of which could be represented by groups of nonlinear simultaneous first-order differential equations. As the digital computer became more prominent, it was often used to cross check, to set up, and to solve problems run on the analog computer. Many digital codes were developed to complement, check out, and even replace the analog computer. Codes such as DAS, MIDAS, PARTNER, DYSAC, MIMIC, DSL/90, and others came into wide use, and some of the reasons for their development have been ably reviewed by Brennan and Linebarger and later by Clancy and Fineberg.