One of video gaming's biggest mysteries has always been what happened to the SNES CD? We all know that both Philips and Sony worked on the unit, with the later going to develop it into the best selling PlayStation after Nintendo pulled out the deal. But no prototypes have ever surfaced or any official docs detailing the technical specifications - until now that is!

Steve Lin of GREEGames, and huge retro fan has been tweeting some very important things of late. These included a photograph that showed several internal Nintendo folders packed to the brim with documents, which he subsequently promised scan and upload online.

Lin followed up by uploading to Twitter countless pages and scans detailing the specifications of the SNES-CD add-on, along with programming guides and much much more, which has filled huge gaps in video game history. The entire collection has been archived in PDF format so we can finally find out what this fabled add-on was all about and dream about what could have been!

SNES CD-ROM PDF[/align:3nib5ouc]