Signals

Many remainders are typically mapped to the blank positions directly above or below jackpot symbols; only one remainder will be mapped to the jackpot symbol itself. (Therefore, despite the fact that the jackpot is won infrequently, a player “comes close” to winning regularly.) The manufacturer designs these mapping functions to achieve desired payback percentages requested by the casino. For machines with very large jackpots relative to the coinage, the divisor is much greater-for example, it’s 256 or 512 for games like Quartermania and Megabucks-to achieve very long odds of hitting the jackpot. Assuming 1 number out of 256 were mapped to each jackpot symbol, the odds of hitting the jackpot would be in 1 in 16,777,216.
The computerized slot machine manufacturer known as IGT owns the patent on the process described above and has allowed Bally’s a license-but stipulating that the divisor can’t be greater than 32, thus not allowing Bally’s to create machines with huge jackpots and small coinages. IGT leases the use of its idea to many other makers of slot machines.

Just as was the case with mechanical slots, under the law computerized machines must be programmed by the manufacturer - although this can be done to the specifications of the casino - and then left alone after that.