If you want to understand just a tiny piece of it, check out this great article about how the overflow flag is implemented in hardware on the 6502: http://www.

If you want to understand just a tiny piece of it, check out this great article about how the overflow flag is implemented in hardware on the 6502: http://www.righto.com/2013/01/a-small-part-of-6502-chip-explained.html http://www.righto.com/2013/01/a-small-part-of-6502-chip-expl... (I love linking people to this article. It's one of my favorite things I've ever read.)