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Logisim is an educational tool for designing and simulating digital logic circuits. With its simple toolbar interface and simulation of circuits as you build them, it 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.Logisim is used by students at colleges and universities around the world in many types of classes, ranging from a brief unit on logic in general-education computer science surveys, to computer organization courses, to full-semester courses on computer architecture.Features It is free! (Logisim is open-source (GPL).) It runs on any machine supporting Java 5 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.Download Logisim!Logisim should run on any platform supporting Java, version 5 or later. Logisim requires Java 5 or later. If you do not already have it on your computer, Java is available from java.sun.com. Download Logisim from Logisim's SourceForge.net page. You will three choices of which release to download. A .jar file - runs on any platform, though not necessarily conveniently. A MacOS .tar.gz file A Windows .exe file If you use MacOS or Windows, I would recommend using the release specific to your platform. To execute the program: With the generic .jar file: On Windows and MacOS systems, you will likely be able to start Logisim by double-clicking the JAR file. If that doesn't work, or if you use Linux or Solaris, you can type ``java -jar logisim-XX.jar'' at the command line. With the MacOS X version: Once the downloaded .tar.gz version is uncompressed (this will likely happen automatically), just double-click the Logisim icon to start. You may want to place the icon into the Applications folder. With the Windows version: Just double-click the Logisim icon. You may want to create a shortcut on the desktop and/or in the Start menu to make starting Logisim easier.If you find Logisim useful, please send me a comment!
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