Logisim, a graphical design and simulation tool for logic circuits, is now at version 2.5.1. This release addresses a few significant bugs from the dramatic changes in the 2.5.0 release earlier this week, and it adds a few less significant features. The biggest of the bugs involves how on some platforms Logisim saved (and loaded) projects involving non-ASCII characters. Another bug could occur when loading multiple libraries, at least one of which is a Logisim project itself.
Among the new features is the Project menu's new "Get Circuit Statistics" menu item, which displays a count of how many components are used within the circuit and within its hierarchy. This feature can also be accessed through the command line.
The Gates library receives further attention in this release. Gates can now have up to 32 inputs, and an option has been added so that they can be drawn larger than the default. Also, you can now control on which side the control line is drawn for controlled buffers and controlled inverters. Finally, this version improves how the basic logic gates are drawn in several minor ways; for example, rectangular OR gates are now drawn using the standard label of "greater-than-or-equal 1."
Finally, the integrated help system is now configured to support full-text search capabilities. Also, while not technically part of the download, the on-line documentation available through Logisim's Web page includes a navigation tree, analogous to the integrated help system.
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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