The console's origins date back to 1988 where it was originally a joint project between Nintendo and Sony to create a CD-ROM for the Super Famicom.[19] Although Nintendo denied the existence of the Sony deal as late as March 1991,[20] Sony revealed a Super Famicom with a built-in CD-ROM drive, that incorporated Green Book technology or CD-i, called "Play Station" (also known as SNES-CD) at the Consumer Electronics Show in June 1991.