Ptolemy II 8.0.1 Applets

This is not the most recent version of Ptolemy II. The most recent version can be found at


You can browse Ptolemy II and run demonstration applets without downloading the distribution by accessing the web copy.

The web copy is merely a set of web pages that were created when we untar'd the distribution on the Ptolemy web site and then enabled the Web Start applications for the Ptolemy II demonstrations. Note that the web copy and the Web Start installations are different, the web copy is a set of web pages where some of the pages contain applets, and Web Start is a set of jar files that get downloaded to your machine so that you can run Ptolemy II at a later time, even if you are not connected to the network. In addition, many of the applet pages include a link to an applet and to a Web Start view/run-only version of the model. The difference between the Web Start version of the individual demos and the Web Start full installation is that the full version includes the ability to create models. For details, see the Installation Summary

Note that to access the web copy applets you need a reasonably high speed internet connection, DSL or better, or you will wait quite a bit for applet downloads.
Note that the applet demonstrations work best with Windows, and that you will need to have the Java 1.5 (or later) plug-in from JavaSoft installed. If you do not have the plug-in installed, you can still browse the distribution and look at the source code and documentation.

To run the applets applets in a web browser, you will need the Java 1.5 (or later) plug-in. If you Java installed on your machine, then the plug-in may already be available. To find out, try running the applets. You may obtain the plug-in from The plug-in is easiest to use from a Windows machine.

One way to determine what version of Java (if any) is installed is to run our Java Version Applet , which uses the Java 1.5 (or later) plug-in. Another way is to run the command below to see whether you have Java installed, and whether it is the proper version:

java -version
If the command cannot be found, or the version that is printed is less than 1.5, you should install the plug-in, JRE 1.5, or JDK 1.5

When you visit a Ptolemy II applet, the first applet that is run will download ptsupport.jar, which is 3.36Mb. Each applet then will download smaller domain specific jar files of between 18k and 65k. If you have a slow network connection, or if there is congestion in the network or on our server, you may experience significant delays before the first applet runs. Many of the applets use Diva, a visualization package. The diva.jar file is roughly 479k. We are interested in any feedback you might have concerning these demos. You can send email to cxh at eecs berkeley edu

Places to go

  • For more information, see the plug-in section of the Ptolemy II Installation page
  • The "Using Vergil" chapter from the Ptolemy II Design Document
  • Limitations Ptolemy II is available in several formats.
  • This page covers accessing Ptolemy II via applets.

    Other formats include:

  • Installing Ptolemy II via the web using Web Start
  • Installing Ptolemy II via a traditional Windows Installer
  • Installing Ptolemy II by downloading source and recompiling