"Hard4Games dives deep into the "Secret Screen" on the Nintendo 64's unreleased controller prototype",
The unreleased Nintendo 64 Secret Screen! The controller was the brainchild of Dane Galden, inventor of the Game Handler, a 3rd-party motion NES controller. The Secret Screen was publicly revealed in a 1997 issue of Electronic Gaming Monthly, but drama ensued when months later, Sega revealed their Dreamcast and VMU. Thanks to Shane Battye for sending this to us and doing a TON of research!