Not sure what's actually written down. However, there are many "understood" rules in the poker room such as no foul language, conducting yourself in a respectable manner, as well as rules of play. The finest unwritten rule IMHO, is that a player can get up, walk away from his chips for an indeterminant amount of time, and NO ONE will ever touch his money. Your money is safer, left exposed on a poker table than in a bank.
I would assume that there is some master list of casino rules but if you ever want to know anything...just ask the dealer or the floorman. They will always be very eager to help you out.