Nintendo had at least 2 generations of game systems before sony entered.  First there was the NES, then the SNES both before the PS.   Around the same time the main competitor was Sega but they stopped making consoles after the dream cast and focussed on games, stand up arcades and, in Japan, gambling machines after merging with Sammy.  Also, there was a Turbo Duo, released by NEC and the first to use CD rom, and Panasonic tried to release a multimedia system that flopped, well before the PS1.  Before even Nintendo was making games, Atari, Coleco and INtellivision all had consoles, and nintendo made games for those consoles (Donkey Kong etc), Sony did not.  Sony has been marketing products in the US since the 1960s but the PS1 was the first game console they ever made.  Sony started as a compny right after WWII, Nintendo is over 100 years old starting as a compny that made toys and card games.  I suspect that some of these products found their way into the US before they stated selling video games but I don't really know.