FromDK on 20 May 2014
Nintendo hired Sony to do a cd drive for N64..
Sony saw all the money in videogaming (or may have done that from start) and suddently they would have the rights to sell games on nintendo's system.. (and becourse there was a "hole" in the contract, they could) That Nintendo would offcourse not let them.. and therefor sony made the ps1 almost 1 year before N64..
It was a very ugly move from sony.. imo
