"OK, I've updated the credits. One last question, though: should I include the original MiniBasic creator (I think he has a Japanese name - I'll look it up)?"
Well, as far as I am concerned, you may give credit to all you wish. That said, the original assembler we are working from was an just an assembler project based on a "how to" document project implementing this dialect which is based on an old BASIC distribution for small machines which is itself based on a distribution for the old Apple computers. My point is, where exactly would you stop?
(This is what I found out when I tried to find a better existing implementation to work from than the horribly confusing assembler you guys translated.)
Edit: And of course, this is the age of the "wiki-people"; there is no telling how wrong the information I found may be...