Many of these have been removed.īug fix: You could copy components from one project and paste them into another, even though the other project's libraries may not support the components being pasted.īug fix: Through starting to edit an attribute with a drop-down menu and then switching to view attributes for something else, the newly viewed attributes would actually change to the value of the previous edit.īug fix: When editing a circuit's appearances, labels would be given a color based on the fill color for rectangles/ovals/polygons rather than the color selected for text. This also happens with triple-clicking a circuit: The view is switched to the circuit, but the tool is not selected for adding instances to itself.īug fix: The combinational analysis "Product of Sums" option did not work when any variable other than the last one was to appear negated in any of the sums.īug fix: In the main editor window, when "Close" was selected from the Window menu, a dialog box popped up giving the Save/Discard/Cancel but if Cancel was selected, the window was still closed (but without saving).īug fix: When "Reset Simulation" was selected while simulation was enabled, the reset values were not propagated through the circuit immediately.īug fix: Several types of exceptions could occur during simulation, particularly when poking the simulation while the simulation is busy. If multiple errors are found, each is displayed.įeature: In Plexers library, added Select Location attribute to multiplexer, demultiplexer, and decoder.įeature: If some components somehow manage to get "off the grid," they are relocated back onto the grid once they are moved.īehavior 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).īehavior change: When clicking the currently viewed circuit, the circuit attributes are shown but no tool to add that circuit to itself is selected. įeature: When errors are in a file being loaded, the file is still partially loaded and displayed.
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Read more about Logisim at, and download it from at. As a Java application, Logisim can run on most major operating systems. To subscribe, go to Įducational institutions around the world use Logisim as an aid to teaching about digital logic and computer architecture. We promise that the traffic on this list will average below one message per month. In particular, a transistor would "convert" a floating (Z) value into an error value when told to transmit its source input now, floating values are transmitted as floating values.īesides addressing many other issues besides these, this version also adds a "Select Location" attribute to the multiplexer, demultiplexer, and decoder, allowing the user to configure where these components' select (and enable) inputs are located relative to the component.įinally, this release marks the introduction of a mailing list where users can subscribe to hear about new developments regarding Logisim. This release repairs the cause of the invalid value assignments and it enhances the file-loading process so that a dialog box appears explaining any problems found, and the portion of the file that could be interpreted is still loaded.Īnother issue found in 2.7.0 was in the behavior of the transistors.
The circuit would typically continue to work normally, but when the file is later reloaded, the file would refuse to load. One of the primary bugs addressed in this release is one where a user could inadvertently change a component's attribute to an invalid value. This release's primary purpose is to address several issue discovered since 2.7.0 was released two weeks ago.
Logisim, a graphical design and simulation tool for logic circuits, is now at version 2.7.1.
Logisim 2.7.1 fixes bugs, improves file handling
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