The "PlayStation" was released in the year 1994. December 3 1994 for Japan,September 9 1995 for the USA, and September 29 1995 for Europe. Australia was November 15 1995
The technology was first going to be used as a colaboration deal between sony and Nintendo in 1989 and even as far back as 1986 for the first conceptions of the PlayStation. When Nintendo pulled out Sony decided to make a console on its own in early 1993. So when the console was invented is different from when a retail sales model was released to the public. Game developers need to have a working console a minimum of a year before the release.