QBasic language spec

Question

I have been challenged by a friend to write a QBasic compiler in QBasic.

Where can I find a language specification for the latest version of the language?

Answer 1

QB64 is a nice clone/extension of QBasic which has a wiki that contains a very detailed language reference sorted alphabetically, by usage, or syntactically.

Note: keywords prefixed with an underscore ('_') are extensions that were NOT part of the classic QBasic language.