Slot machines used to fill casino floors in bulky cabinets over 40 inches tall....

https://kylersexpertthoughts.almoheet-travel.com/how-do-slot-games-fit-reels-and-buttons-on-a-phone-screen

Slot machines used to fill casino floors in bulky cabinets over 40 inches tall. Now they easily fit in the palm of your hand on screens around 6 inches wide. This shift shows how technology has shrunken big machines into portable fun you can play anywhere