If you like the "call a subroutine, subsequent data is interpreted as custom instructions" on the 6502, check out Super-Mon / NakedOS by Martin Haye. Very nicel

If you like the "call a subroutine, subsequent data is interpreted as custom instructions" on the 6502, check out Super-Mon / NakedOS by Martin Haye. Very nicely done, incredibly minimal programming environment / OS for the Apple II: https://bitbucket.org/martin.haye/super-mon/wiki/Home https://bitbucket.org/martin.haye/super-mon/wiki/Home