42 Revenue from gaming machines in pubs and clubs accounts for more than half of the 4 billion in gambling revenue collected by state governments in fiscal year In Queensland, gaming machines in pubs and clubs must provide a returnrate of 85 while machines. If the payout channel had filled up, the payout became more generous, if nearly empty, less so thus giving good control of the odds. 30 Modern slot machines are controlled by eprom computer chips and, in large casinos, coin acceptors have become obsolete in favor of bill acceptors. Players would insert a nickel and pull a lever, which would spin the drums and the cards they held, the player hoping for a good poker hand. Once triggered, free spins bonus round award a number of spins free of charge to the player. "Wizard of Odds- Slot machines explained". The player is encouraged to keep playing to reach the bonus: even if he is losing, the bonus game could allow him to win back his losses. Parlor operators naturally set most machines to simply collect money, but intentionally place a few paying machines on the floor so that there will be at least someone winning, citation needed encouraging players on the losing machines to keep gambling, using the psychology of the. 15 This type of machine had appeared in Australia from at least 1994 with the "Three Bags Full" game. A slot machine's theoretical payout percentage is set at the factory when the software is written. A drop box contains a hinged lid with one or more locks whereas a drop bucket does not contain a lid. This can sometimes increase the chance of winning, especially if two or more reels are held. The number of free spins differs from game to game;.e. Mostly scatter symbols are preferred for this activation, although wild symbols (or a completely different symbol dedicated for this feature) can be used too.