Modern gaming machines use computer technology to operate their functions. Slot machine outcomes are determined unsing a Random Number Generator (RNG) which is a mathematically-based program that selects groups of numbers to determine which symbols are selected to produce a winning or losing outcome.

Ticket-in, ticket out (TITO) machines are used in casino slot machines to print out a slip of paper with a barcode indicating the amount of money represented. These can in turn be redeemed for cash at an automated kiosk.