Logisim 2.0 is a complete overhaul of Logisim, making it
dramatically more powerful than before. Among the more significant new
features are ``wire bundles,'' permitting a single wire to carry
several bits in parallel, and a much-enhanced interface allowing
support for including libraries of components, including several built
into Logisim as well as libraries defined using Logisim. As a rough
measure of the extent of the changes, version 2.0.0 includes five
times as many lines as version 1.09c (38,612 lines versus
After a long string of beta releases, version 2.0 is now available
in production form! The Download Logisim
page allows you to download the latest Logisim version. And please send me any comments, suggestions, or bug
reports! I'll be very interested.
Version 2.0 Features
- Include wires that can carry multi-bit values. (This feature
is certainly the biggest.)
- Include ``splitters'' that can select out some of the bits of a
- Do a somewhat more realistic approximation of gate delays.
- Compute the Boolean expressions corresponding to a combinational
circuit to corresponding Boolean expressions.
- View a circuit's truth table and compute the corresponding
minimized sum-of-products expressions.
- Generate a circuit from a set of Boolean expressions.
- Access XOR, NOR, NAND, and XNOR gates.
- Allow multi-bit wires to pass through components (allowing bitwise
AND, for example).
- Access multiplexers, demultiplexers, decoders.
- Access adders, subtractors, comparators, multipliers, dividers.
- Navigate into (and out of) the current
state of subcircuits.
- Include libraries of circuits in Logisim, allowing you to
place a library of Logisim-built components into a file and
to share that library across circuits in different files.
- Use libraries of circuits designed in Java.
This involves the introduction of a Java API for designing
- An undo feature, including the ability to undo multiple
- Configure which tools are invoked by the mouse
- See a proper rectangle when using the selection tool
to select a rectangle.
- Magnify the canvas using a ``zoom factor.'' This is
intended mostly for when the program is used with a classroom
- Give user the option to export to a GIF file, mostly so that
circuits can easily be put on Web pages or brought up within PowerPoint
- Choose between shaped and rectangular gates (sometimes
called the American and European styles).
- Customize the language (as it appears in menu items and dialog
boxes, for example). (This is not visible within Logisim, and it
will not be unless somebody volunteers to translate Logisim to another
language. But internally, Logisim is translation-ready.)
- Configure which tools appear in the toolbar.
- Save customization settings in a file, which can be chosen from
the command line. I'm particularly interested in doing this so that
teachers can configure the settings for the benefit of a class of