Take a look at this Sega Saturn. It’s very long.
Apparently, this Sega Saturn Address Checker was a development unit that made sure games weren’t violating Sega’s guidelines on memory usage. An upgraded model had a row of several dozen LEDs mounted on its surface to indicate potential problems. Other than that, the Address Checker functioned as a normal Sega Saturn.
This has been your daily dose of video game weirdness. Have a pleasant evening.