The Super NES CD-ROM (commonly abbreviated to SNES-CD) is an unreleased add-on for the Super Nintendo Entertainment System (SNES) video game console. It was built upon the functionality of the cartridge-based SNES by adding support for a CD-ROM-based format known as Super Disc. The SNES-CD was developed in a joint venture between Nintendo and Sony and was publicly announced in 1990. Sony also planned to release it as a hybrid console, the Play Station and planned to use their Super Disc for video and other multimedia.
https://en.wikipedia.org/wiki/Super_NES_CD-ROM