The SNES Classic Edition's controller ports are actually functional, even though the console only uses one controller at a time. You can plug in a second controller, but it won't work in-game unless the game specifically supports two players. elaborate
The Commodore 64GS, despite its name, wasn't significantly different from the standard Commodore 64; its main upgrade was a built-in 1541-compatible floppy disk drive. elaborate
The Sega Saturn's controller had two distinct parts that could be detached and used independently, a design choice that proved confusing to many consumers. elaborate
The Neo Geo Pocket Color had a built-in clock, a feature not common in handheld consoles at the time. elaborate
The Sega Genesis/Mega Drive's sound chip, the Yamaha YM2612, was capable of producing more simultaneous voices than the Super Nintendo's sound chip. elaborate
The SNES controller's distinctive gray color was chosen to match the console's design, but also to avoid looking too much like the Sega Genesis's controller. elaborate