> Let me tell you the story so far; the process, obstacles, and solutions involved in making a roguelike dungeon crawler playable on systems like the Commodore 64, Commodore PET, and even more constrained machines.

Javascript is not running on a Commodore 64 with decent performance.

[0] https://github.com/SuperIlu/DOjS

C89 and C99 are both standards that are endorsed by ANSI. [0] (At least, they were endorsed, as they're now both behind the times.)

The Lua interpreter is written in a subset of C that behaves identically when compiled as C++, they call this 'Clean C'. [1]

[0] https://en.wikipedia.org/wiki/ANSI_C

[1] https://www.lua.org/manual/5.4/manual.html

But I could imagine assumptions about it being a problem if you try to add a 6502 backend to an existing compiler for other platforms.