Slot machines used to fill entire walls with screens over 40 inches wide, heavy...

https://gregorysimpressivenews.iamarrows.com/why-do-modern-casino-cabinets-include-internal-wiring-and-speakers

Slot machines used to fill entire walls with screens over 40 inches wide, heavy cabinets, and flashing lights. Now, many games fit neatly on 6-inch phone screens, letting you spin reels anytime and anywhere