What does PS1 stand for?

MLA style: "PS1." Acronym Finder . 2012. AcronymFinder.com 3 Jun. 2012 http://www.acronymfinder.com/Personal-System-1-(PS1).html
Chicago style: Acronym Finder . S.v. "PS1." Retrieved June 3 2012 from http://www.acronymfinder.com/Personal-System-1-(PS1).html
APA style: PS1. (n.d.) Acronym Finder. (2012). Retrieved June 3 2012 from http://www.acronymfinder.com/Personal-System-1-(PS1).html

Personal System 1

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Plate (Number) Strip of 3 Coil Stamps (philately) Plate (Number) Strip of 5 Coil Stamps (philately) People Soft/Human Resource Management System (Canada) Power Spectrum of Heart Rate Variability Programming Language M Physical Security/Pilferage Code Private Sector Prison Industry Enhancement Certification Proximal Segment of Preterminal Portal Venules Papillary Stenosis and Sclerosing Cholangitis Puget Sound/Strait of Georgia (Washington, US and British Columbia, Canada)		Personnel Specialist 1st Class (USN Rating) Photosystem 1 (photosynthesis) Play Station 1 (Sony) Port Security Specialist 1st Class (USCG rating) Public School 1 (West New York School District; New York, NY) Personal System 2 (IBM PC and a connector format) Personnel Specialist 2nd Class (USN Rating) Photosystem II (photosynthesis) Pokémon Stadium 2 (video game) Port Security Specialist 2nd Class (USCG rating)