I any case, I am thinking of scrapping the idea of using an intermediate language such as the one in the People's Computer Company/Dobbs Journal. I read quite a bit of the Atari 6502 BASIC manual, and was impressed. Lines, ordered by number, two data types, strings and numbers. Immediate mode and run mode. I think I will have to consult a few different approaches: MS 8K, BBC, ECMA-55, GW-BASIC... I think my Arduino assembly has levelled up enough to try and take more training wheels off.