Logisim, a graphical design and simulation tool for logic circuits, has now reached version 2.1.6. Besides several bug fixes, the new version expands the maximum size of memory components to 16 meg, and it permits gates to be drawn with only two inputs.
The most notable additions, though, are two experimental features, which can be enabled via the Preferences window. These features will likely become standard in future versions of Logisim, but they are undergoing a trial period so that Logisim's user base can discover problems and provide feedback.
The first of the experimental features is the long-requested characteristic of automatically "stretching" wires to preserve connections when components are dragged using the selection tool. It works only when components are moved horizontally or vertically.
The second experimental feature is configuration for Logisim to use OpenGL or Direct3D graphics acceleration. One user has discovered that doing this via the command line dramatically improves Logisim's performance on his system. This new feature should make this customization easier for those who don't normally start Logisim from the command line.
Educational institutions around the world use Logisim as an aid to teaching about digital logic and computer architecture. As a Java application, Logisim can run on most major operating systems. Read more about Logisim at http://www.cburch.com/logisim/, and download it from SourceForge.net at http://sourceforge.net/projects/circuit/.
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