The turing machine applet:



The rules for this binary number adding machine are:

1010R 1111R 1o1oR 1i1iR 1 1 R 1+2+R

202oR 212iR 2o2oR 2i2iR 2 3 L

3o4 L 3i5 L 3+7 L

4o4oL 4i4iL 4+4+L 401oR 411iR 4 1oR

5o5oL 5i5iL 5+5+L 501iR 516oL 5 1iR

6011R 6160L 6 11R

7070L 7171L 7o70L 7i71L 7 0 R

Where the form of the rules are:

curent state, character read, new state, what to write, direction to move

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A newer GUI, together with a turing machine that computes prime numbers, is here.

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Here's the main source:

TuringMachineApplet.java
TuringMachine.java
TuringRuleEditorApplet.java
TuringRule.java
TuringTape.java

And some tiny classes that could have probably been implemented as inner classes (and in their own files so they can be public and javac won't complain.)

IntFieldListener.java
SelectAllListener.java
SingleCharListener.java
WindowCloser.java

or download the whole package as a zip file.