Damien McFerran, writing for Nintendo Life:

Before Sony entered the home console arena it worked with Nintendo on a CD-ROM drive for the SNES. The aim was to eventually release a combined console – called the PlayStation – which would play SNES carts and SNES CD-ROM games.

Of course, this never came to pass – at the 1991 CES Sony officially announced the system, only to discover that at the same event Nintendo confirmed that it was working with rival Philips instead. It was one of the most infamous double-crosses in video game history, but Sony would have its revenge by creating the stand-alone PlayStation system, a best-selling console which would end Nintendo’s dominance of the industry and establish the brand for years to come.

Great story. Click here for images of the prototype. So cool. Bizarre to see the Sony and Nintendo branding together like this.