Logisim / News: Recent posts

Logisim 2.0.2 addresses simulation errors and minor bugs

Logisim, a graphical design and simulation tool for logic circuits, is now available in version 2.0.2. This new version addresses some rare but highly problematic errors in simulating circuit behavior, as well as repairing some more minor bugs. Additionally, the new version features a new options tab for modifying parameters related to circuit simulation. Here, the user can disable the feature of random noise with gate delays added in version 2.0.1 for flip-flops. Also, the user can extend the cutoff for giving up on a circuit as oscillating.... read more

Posted by Carl Burch 2005-11-21

Logisim 2.0 exits beta phase, sees first production release

Logisim, a graphical design and simulation tool for logic circuits, is now available as a non-beta, open-source program for the first time. This new version, named 2.0.0, has a few new features, polishes off some minor bugs, and includes a distribution specifically for Windows computers.

Besides the Windows distribution, the most significant new feature is the "component tip," which displays information about circuit components temporarily when the mouse hovers over it. This is particularly useful with subcircuits, where hovering over an input or output of the subcircuit box will report the label associated with the corresponding pin in the underlying circuit layout. A number of other components feature component tips also. (The project options allow you to turn off this feature if you find them irritating.) Also added into Logisim is an option in its Simulate window to reset the simulation to its original state.... read more

Posted by Carl Burch 2005-10-31

Logisim 2.0 Beta 24 includes library reference, bug fixes

Logisim, an extensive Java-based educational tool for
graphical design and simulation of digital logic circuits, has been updated to a new version, 2.0 Beta 24. The new version provides reference pages explaining all of the built-in libraries in detail. It also provides a number of bug fixes, the most notable of which is a lack of support for RAM with 32-bit values and poor behavior by arithmetic components when handling 32-bit values.... read more

Posted by Carl Burch 2005-10-26

Logisim 2.0 Beta 23 repairs bugs

Logisim, an extensive Java-based educational tool for graphical design and simulation of digital logic circuits, has been updated to a new version, 2.0 Beta 23. The new version repairs a significant bug with configuring the behavior of a small number of built-in components (Constant, Clock), and it repairs a minor problem with some images in the beginner's tutorial.

Additional information about Logisim is available at http://www.cburch.com/logisim/.
Logisim can be downloaded through SourceForge.net at http://sourceforge.net/projects/circuit/.

Posted by Carl Burch 2005-10-17

Logisim 2.0 Beta 22 sports better documentation, options

Logisim, an extensive Java-based educational tool for graphical design and simulation of digital logic circuits, has been updated to a new version, 2.0 Beta 22.

The new version includes a handful of significant user interface enhancements. User configuration, previously provided through an Options menu, is now supported using a separate dialog window. The user's guide has been thoroughly updated and rewritten to reflect the most current version. Additionally, the built-in libraries now include circuit components for dividing, negating, and comparing integers.... read more

Posted by Carl Burch 2005-10-13

Logisim 2.0 Beta 21 addresses template behavior

Logisim, an extensive Java-based educational tool for graphical design and simulation of digital logic circuits, has been updated to a new version, 2.0 Beta 21, that addresses several template-related issues.

Previous versions had a "Revert To Defaults" option, but the reverting was incomplete in that it did not include the default options relating to tools. Besides including these defaults in reverting, the new version also fixes a related bug new to Version 2.0 Beta 20 where using Revert To Defaults prevented subsequently saving the file.... read more

Posted by Carl Burch 2005-07-25

Logisim's performance improved in 2.0 Beta 20

A new version is now available for Logisim, an extensive Java-based educational tool for graphically designing and simulating digital logic circuits.

Version 2.0 Beta 20 is primarily a performance-based enhancement, with several internal changes based on profilers' analysis of its memory and CPU usage. Logisim is now significantly more efficient in its use of the CPU and memory - although it is still rather intensive with both resources.... read more

Posted by Carl Burch 2005-07-19

Logisim 2.0 Beta 19 released

A new version is now available for Logisim, an extensive Java-based educational tool for graphically designing and simulating digital logic circuits. Version 2.0 Beta 19 includes many wide-ranging usability enhancements, cumulatively adding to a major improvement over previous Logisim versions. Many of the features are based on suggestions of a computer organization class of roughly two hundred students (at U California/Berkeley) who used the early betas of Logisim 2.0 in May.... read more

Posted by Carl Burch 2005-07-15

Logisim 2.0 Beta 18 released

Beta 18 repairs several minor bugs, most relating to how selection operations deal with wires (and particularly undoing those selection operations). There is one notable change in designed behavior: When creating a wire that crosses a component's connection point, the wire is split at that point.

Under the hood, Beta 18 uses a completely rewritten system for manipulating wires and selections. This new system allows the correcion of several minor bugs that were previously present; but a new system is inevitably prone to new bugs that did not exist before. As always, bug reports are appreciated.... read more

Posted by Carl Burch 2005-07-11

Logisim now hosted on SourceForge.net (Version 2.0 Beta 17)

Logisim, a popular interactive application for designing and simulating digital logic circuits, is now being hosted through SourceForge.net.

Logisim has been in continuous development since early 2001, and today is used in many colleges and university computer science courses, as well as by several individual enthusiasts. It runs on any platform supporting Java 1.4.

The last few months have provided the first glimpses of Logisim 2.0, which significantly expands the program's capabilities, well beyond most similar programs. The latest beta release, Beta 17, appears stable and incorporates for the first time the feature of deriving a Boolean expression from a combinational circuit, of minimizing such expressions, and of constructing a circuit from a Boolean expression.... read more

Posted by Carl Burch 2005-07-08

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