Wow! This looks cool!
So this dude edisoncarter cracked open what appears to be a cheesy 3rd party PS2 controller (save the good stuff for the gaming, we always say), hooked up the lines to a parallel port for signal injection, and then hash-cracker style used a custom app that ran brute force key combinations until he came up with a slew of unreleased cheat codes for GTA San Andreas. Damn, dude. Remember when you were really young and you thought that cheat codes were discovered by this really awesome unknown kid who just sat there pushing buttons for hours a day until he figured them all out for everyone else? And then trying to discover your own cheat codes, but never being able to? You humble us, edisoncarter.