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

https://fun-wiki.win/index.php/Why_Can_Digital_Reels_Do_Things_Mechanical_Reels_Cannot%3F

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