I had a single sheet double sided plastic reference card for the 6502. Had everything needed to dig deep into the Apple ][+ / ][e computers we had at school.

I had a single sheet double sided plastic reference card for the 6502. Had everything needed to dig deep into the Apple ][+ / ][e computers we had at school. My most productive use of that was to hack Lode Runner to start on arbitrary levels so we could get to the higher levels of the game during lunch break. Such fun!