A graphical tool for designing and simulating logic circuits
With its simple toolbar interface and simulation of circuits as you build them, Logisim is simple enough to facilitate learning the most basic concepts related to logic circuits.
With the capacity to build larger circuits from smaller subcircuits, and to draw bundles of wires with a single mouse drag, Logisim can be used (and is used) to design and simulate entire CPUs for educational purposes.
- It is free! (Logisim is open-source (GPL).)
- It runs on any machine supporting Java 1.4 or later; special versions are released for MacOS X and Windows. The cross-platform nature is important for students who have a variety of home/dorm computer systems.
- The drawing interface is based on an intuitive toolbar. Color-coded wires aid in simulating and debugging a circuit.
- The wiring tool draws horizontal and vertical wires, automatically connecting to components and to other wires. It's very easy to draw circuits!
- Completed circuits can be saved into a file, exported to a GIF file, or printed on a printer.
- Circuit layouts can be used as "subcircuits" of other circuits, allowing for hierarchical circuit design.
- Included circuit components include inputs and outputs, gates, multiplexers, arithmetic circuits, flip-flops, and RAM memory.
- The included "combinational analysis" module allows for conversion between circuits, truth tables, and Boolean expressions.
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What's New in This Release:
- Feature: When errors are in a file being loaded, the file is still partially loaded and displayed. If multiple errors are found, each is displayed.
- Feature: In Plexers library, added Select Location attribute to multiplexer, demultiplexer, and decoder.
- Feature: If some components somehow manage to get "off the grid," they are relocated back onto the grid once they are moved.
- Behavior change: With transistors and transmission gates, a floating value is passed through as floating regardless of the value of gate (including a floating or error gate value).