The guy wanted to see if it could be done on a 6502. Who said it had to be 'useful'? Why are you so sure your definition of 'useful' and his definition of 'useful' are the same here? Why does virtually every post on HN about someone's personal, possibly quixotic quest to do something for fun attract a pack of tech-Karens who tut-tut it with "well OBVIOUSLY you should have done something different than what you did. I should tell the Manager.".