JDigitalSimulator is a platform independent open source Electronic Design Automation software entirely written in Java.

Please download the latest release from the releases section here on GitHub. Visit the project homepage for some additional information.

To run JDigitalSimulator download the JAR file and run it with:

java -jar jds-2.x.x.jar

In the pre-open-source era JDigitalSimulator was released without a license in version 1.* under an old de.ksquared namespace. With version 2.* the code was released on GitHub under the GNU General Public License. The released code was cleaned up and moved to a new namespace lc.kra.

Since version 2.0.2 and later on fixed with version 2.3.0, code was added so that old JDigitalSimulator worksheets of version 1.* can be opened in the latest version of the tool. If you are using a later version of Java, e.g. Java 21 the following command line parameter will be necessary in order to be able to load old files:

--add-opens java.base/java.io=ALL-UNNAMED

After you re-saved the worksheet with a new version of this tool, you can again omit this command line parameter.

JDigitalSimulator supports a plugin concept, as described on the homepage here. If you are interested to write a plugin on your own, check out the example plugin files.

Since the namespace was changed from de.ksquared to lc.kra, old plugins that are still using imports from the de.ksquared package, will no longer work. Since version 2.5.0 JDigitalSimulator supports loading of legacy plugins with the help of transpiling their code using ASM. In order to enable this legacy mode, put your 1.* plugin JARs into the /plugins folder as you would do normally. Also download asm.jar and asm-commons.jar and put them into the /plugins folder alongside your plugin files. In case you are using a later version of the Java JDK, e.g. Java 21, you will also need to add the following command line parameter when starting your JVM:

--add-opens java.base/jdk.internal.loader=ALL-UNNAMED

When now launching JDigitalSimulator through the JAR file or the .exe provided, JDigitalSimulator will use the ASM JAR files, to transpile the old plugins on the fly.

To build JDigitalSimulator on your machine, checkout the repository, cd into it, and call:

mvn clean install

In case you are trying to build on a 64bit Linux distribution, the 32bit Windows launcher will require the following libraries to be installed on your system lib32z1, lib32ncurses5, lib32bz2-1.0 and zlib1g:i386.

The code is available under the terms of the GNU General Public License.