PSone
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| Developer | Sony Computer Entertainment |
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| Manufacturer | Sony |
| Product family | PlayStation |
| Type | Video game console |
| Generation | Fifth generation era |
| Retail availability | July 7, 2000 – March 23, 2006 |
| Units sold | 28.15 million |
| Controller input | DualShock |
A number of models of Sony's PlayStation video game console were produced.
The PlayStation (except PS one) went through a number of variants during its production run, each accompanied by a change in the part number. From an external perspective, the most notable change was the gradual reduction in the number of external connectors from the back of the unit. This started very early on with the original Japanese launch units; the SCPH-1000, released on December 3, 1994, was the only model that had an S-Video port, which was removed on the next release. This also led to a discrepancy where the US and European launch units had the same part number series (SCPH-100x) as the Japanese launch units, but had different hardware (Rev. B silicon and no S-Video port)—they were followed by the Japanese SCPH-3000, so for consistency should have been SCPH-3001 and SCPH-3002 (this numbering was used for the Yaroze machines, which were based on the same hardware and numbered DTL-H3000, DTL-H3001, and DTL-H3002). Also, the first models (DTL-H1000, DTL-H1001, DTL-H1002) had problems with printf function and developers had to use another function instead. This series of machines had a reputation for CD drive problems—the optical pickup sled was made of thermoplastic and placed on the power supply that accelerated and eventually developed wear spots that moved the laser into a position where it was no longer parallel with the CD surface—a modification was made that replaced the sled with a die-cast one with hard nylon inserts, which corrected the problem.
The PAL region consoles from SCPH-1002 up to SCPH-5552 were different from the systems released in other regions in that they had a different menu design; a grey blocked background with square icons for the Memory Card (an icon showing a PlayStation with 2 memory cards inserted) and CD player (an icon with musical keyboards) menus. The CD player also included reverberation effects unique to those systems until the release of the PS one in 2000, which featured a slightly modified version of the BIOS.
With the release of the SCPH-5000 series being produced only in Japan, it followed the same exterior design as the Japanese SCPH-3xxx series, its only differences being that it upgraded some flawed components from previous models and a reduced retail value. This model was followed by the SCPH-550x and exclusive PAL SCPH-5552 units, released in April 1997. A number of changes were made to the SCPH-550x series internally (CD drive relocated, shielding simplified, PSU wiring simplified) and the RCA jacks and RFU power connectors were removed from the rear panel and the printed text on the back was changed to reliefs of the same. Starting with the SCPH-550x series, PAL variants had the "power" and "open" buttons changed from text to symbols which later will be used on the redesigned PS one models. Originally, the PlayStation was supposed to have provision on Video CD support, but this feature was only included on the Asian exclusive SCPH-5903 model.
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