I can answer that. It's because its working title was "Play-Station X". Eventually they dropped the X and the hyphen, but as Tom said, people still refer to it as the PSX to distinguish it from its younger brothers.
Dan, it's not called the PS1 because there's no difference in pronunciation from PSOne, which is a different beast.
__________________
Hand me my flamethrower... it's the one that says 'Bad Motherfucker'.
|