th original playstation was called psx before it was all revealed and stuff. usual media hype kinda stuff like nintendo calling the n64 the dolphin and that kinda nonesense with the microspft xgna.

so people continued to call the playstation the psx. it was quite accepted. you could also have been called the ps1, ps or psone.

then sony made it all very complicated by releasing a psx which was a ps2, dvd recorder, hard drive and a few other gadgets in a shiny metal box.

and that led to this confusion.