What does this do?

This allows you to experiment with basic PPC Assembly code directly on your computer.

Why is this useful?

It saves you the trouble of running assembly on a PowerPC-based system since computers generally use x86 assembly so PowerPC is not natively supported. Also, by using the interpreter you will not crash if you access a bad memory address for instance and you can try again immediately.

Where can I download the application?

Here.

What are the requirements to run this?

You only need to have Java installed.

Why are so many instructions unsupported?

Because it takes a lot of time to implement them. Progress on this might be made later on. Have a look through the source code to find out what is supported. It should be easy to tell.