Well, Turf is right honestly.
PlayStation was the brainchild of Ken Kutaragi, a Sony executive who had just come out of his hardware engineering division at that time and would later be dubbed as "The Father of the PlayStation".
The console's origins date back to 1988 where it was originally a joint project between Nintendo and Sony to create a CD-ROM for the Super Famicom. Although Nintendo denied the existence of the Sony deal as late as March 1991, Sony revealed a Super Famicom with a built-in CD-ROM drive (that incorporated Green Book technology or CDi) at the Consumer Electronics Show in June 1991. However, a day after the announcement at CES Nintendo announced that it would be breaking its partnership with Sony, opting to go with Philips instead but using the same technology. The deal was broken by Nintendo after they were unable to come to an agreement on how revenue would be split between the two companies. The breaking of the partnership infuriated Sony President Norio Ohga, who responded by appointing Kutaragi with the responsibility of developing of the PlayStation project to rival Nintendo.
At that time, negotiations were still on-going between Nintendo and Sony, with Nintendo offering Sony a "non-gaming role" regarding their new partnership with Philips. This proposal was swiftly rejected by Kutaragi who was facing increasing criticism over his work with regard to entering the video game industry from within Sony. Negotiations officially ended in May 1992 and in order to decide the fate of the PlayStation project, a meeting was held in June 1992, consisting of Sony President Ohga, PlayStation Head Kutaragi and several senior members of Sony's board. At the meeting, Kutaragi unveiled a proprietary CD-ROM-based system he had been working on which involved playing video games with 3D graphics to the board. Eventually, Sony President Ohga decided to retain the project after being reminded by Kutaragi of the humiliation he suffered from Nintendo.
Heh went ahead and quoted the info from Wiki
What I see from that is more that Nintendo kinda caused Sony's console to be born (since Mr-Sony-President's anger pushed him forward in the project) rather than Sony caused Nintendo to fall, but that might just be me.
Back on topic: when I was young, it was the "Nintendo". Later on, it became the "NES" pronounced as a word (in my defense, it doesn't sound too bad in French
). Nowadays I say "NES" as a word in French, and "N.E.S" in English, just because I feel that's how it's best heard in each language. Most people in Quebec call it "the first Nintendo" now, or the "NES" like I do. "N.E.S" sounds awful in French actually (to me anyway).
SNES I pronounce "Super NES" (sounds like "super ness"). I don't know why but I pronouce it the same way in French and English, even though I say NES differently. I'm weird like that