PSpice is a SPICE analog circuit and digital logic simulation software that runs on personal computers, hence the first letter "P" in its name. It was developed by MicroSim and is used in electronic design automation. MicroSim was bought by OrCAD which was subsequently purchased by Cadence Design Systems. The name is an acronym for Personal Simulation Program with Integrated Circuit Emphasis. Today it has evolved into an analog mixed signal simulator.
PSpice was the first version of UC Berkeley SPICE available on a PC, having been released in January 1984 to run on the original IBM PC. This initial version ran from two 360 KB floppy disks and later included a waveform viewer and analyser program called Probe. Subsequent versions improved in performance and moved to DEC/VAX minicomputers, Sun workstations, the Apple Macintosh, and the Microsoft Windows platform.
PSpice, now developed towards more complex industry requirements, is integrated in the complete systems design flow from OrCAD and Cadence Allegro. It also supports many additional features, which were not available in the original Berkeley code like Advanced Analysis with automatic optimization of a circuit, encryption, a Model Editor, support of parametrized models, has several internal solvers, auto-convergence and checkpoint restart, magnetic part editor and Tabrizi core model for non-linear cores.
Request page of the free, limited-feature demo version of OrCAD (that includes PSpice) at Cadence website.