That's the title, but the main innovation was using a random number generator to choose from among more positions than symbols that the physical wheel possesses, thus allowing different odds for different symbols. The interesting bit comes from claim 8 and 9:

> a random number generator for selecting one number from a plurality of numbers each representing one of said different angular rotational positions, said plurality of numbers exceeding the number of rotational positions of said reel such that a plurality of numbers represents some of the reel positions; and

...

> assigning a different quantity of numbers to each position to obtain the win odds desired.