The original PlayStation, released in Japan on December 3, 1994, was the first of the ubiquitous PlayStation series of console and hand-held game devices. It has included successor consoles and upgrades including the Net Yaroze (a special black PlayStation with tools and instructions to program PlayStation games and applications), "PS one" (a smaller version of the original) and the PocketStation (a handheld which enhances PlayStation games and also acts as a memory card). It was part of the fifth generation of video game consoles competing against the Sega Saturn and the Nintendo 64. By December 2003, the PlayStation and PS one had shipped a combined total of 102.49 million units, eventually becoming the first video game console to sell 120 million units.

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PS One

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Released on July 7, 2000, concurrently with its successor the PlayStation 2, the PS One (stylized as PS one) was a considerably smaller, redesigned version of the original PlayStation video game console. The PS one went on to outsell all other consoles, including its successor, throughout the remainder of the year. It featured two main changes from its predecessor, the first being a cosmetic change to the console and the second being the home menu's Graphical User Interface; a variation of the GUI previously used only on PAL consoles up to that point.

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(Infomation from Wikipedia https://en.wikipedia.org/wiki/PlayStation#PlayStation)

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C & D Retro Gaming's Games Catalogue for Sony Playstation