I think I have decided on the memory map for the 2K Tiny BASIC I am writing.
I have also ironed out exactly what the syntax is for the GNU assembly for AVR microcontrollers.
Much thanks to the comments @ @permacomputer .
Just starting to wrap my head around having so many registers on the Arduino Uno, haha. Much of the inspiration for this project is gleaned from a 6502 KIM-1 Tiny BASIC.
Watch this space.