I'm working on a project at the moment, and it involves ZASM. However, currently, the documentation is... shall we say, less than adequate.
To remedy this, I propose that we gang up, and anyone who knows anything about ZASM join in and help document everything.
I've started a new page on the wiki with a list of all the instructions and registers. I will copy some stuff from the old page, but there is quite a bit stuff missing (both in terms of instructions and documentation), as the old page is 2 and a half years old.
If you don't have a wiki account, please post here instead, and I'll work on putting it in the wiki.