Dmitry Teytelman, email@example.com
An event-driven logic-level simulator for MOS circuits
Version 9.2, production.
irsim is an X11 based simulator for MOS circuits. It has two simulation modes, either switch where each transistor is modelled as a voltage controlled switch, or linear where each transistor is modelled as a resistor in series with a voltage controlled switch, and each node has a capacitance.
Where and How to obtain it
You can obtain irsim from: sunsite.unc.edu.