There are two main changes here:

• There is a new emulator which is easier to use without needing the cli. It is also a bit faster and has better options for debugging.
• The extension mechanism has been removed from the specs. Instead the previously optional sound-extension is now the default.

This can be seen as a breaking change, so the version has been bumped to 2.0. The main reason for this change is that it makes the system a lot easier to explain and define.

This release brings two main features:

• improved performance of the emulator (and some fixes)
• two builtin expansions (random numbers and sound)

The specification is now fixed.