Spice, the open source circuit simulator from the University of California, Berkeley
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SPICE (Simulation Program with Integrated Circuit Emphasis) is a general-purpose, open source analog electronic circuit simulator. It is a program used in integrated circuit and board-level design to check the integrity of circuit designs and to predict circuit behavior.
Initial source for Spice 3f5 obtained at https://embedded.eecs.berkeley.edu/pubs/downloads/spice/spice3f5.tar.gz
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