Paul Scott Robson has several open source (MIT license) Basic implementations for 6502 systems available on GitHub at https://github.com/paulscottrobson. These include SuperBasic for the Foenix C256 Junior, MegaBasic for the Mega65, and several others. I'm not sure how mature each one is. Some are fairly basic (no pun intended), while others (6502-basic, for example) implement some more advanced features like procedures, local variables, and built-in assembler.

It is so awesome to see dmsc’s Fast Basic being ported to other platforms! Daniel (dmsc) is a tremendous asset to the Atari 8 bit community. I look forward to seeing how it works out for you.

@dmsc, it is great to see you here! I’ve been lurking here for years, saw the Altirra/Fast Basic references and your posts, and had to join.

Welcome, painintheworld! Congrats on graduating beyond lurker status!

-- Jeff

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In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html

FWIW, I did actually end up writing about 75% of a Comal structured BASIC interpreter. I'm currently waiting on the last bit, which is the floating point library, and then it should be ready for release.