(The game reads cheat codes backwards.) Here is an excerpt. Over these few weeks, Skiller has been letting his CPU keep outputting code combinations, and now we have all the combinations ending with L1. Due to the way the game's cheat codes are programmed, it was discovered that every cheat had a huge number of different variations to it. The last unknown cheat code combinations were found by interpreting the hash values created by different combinations of button presses, and then comparing the resulting hashes with hashes for cheat codes programmed into the game.
Back in the beginning of May, we reported about all San Andreas cheat codes being found.