> I wrote most of the Wikipedia article about BetaBASIC

If you still want to work on it, add sample code. I think that’s a must for a programming language page.

I see https://en.wikipedia.org/wiki/Sinclair_BASIC doesn’t, either but at least it has a list of commands. I still prefer sample code, though. It is the better way to present things, even though it will give an incomplete overview of capabilities.