[fuzzfactor]

It's a short document but basically all you need to go forward doing worthwhile programming from there.

And come back to as a reference to help you get the most out of the language within the limitations of that particular version.

There should be lots more pieces of hardware which are ready-to-program with at least a BASIC as minimal as this today, with concise documentation intended as a full reference first, with programming tips and examples along the way.