<P> There were many revisions of the PlayStation 2 (PS2) in its history from 2000 to 2013, some only of internal construction and others involving substantial external changes . These are colloquially known among PS2 hardware hackers as V0, V1, V2,..., V18 . Each region receives a different model number; for example, the V18 was released in North America as SCPH - 90001, in Australia as SCPH - 90002, and in Hong Kong as SCPH - 90006 . The final digit is a region code with no bearing on the hardware; many games and DVDs are restricted to certain regions, and the system software displays in different languages . </P> <P> The PS2 is primarily differentiated between models with the original "fat" case design, and "slimline" models introduced at the end of 2004 . In 2010 a television incorporating a PS2 was introduced . </P> <P> Three of the original PS2 launch models (SCPH - 10000, SCPH - 15000, and SCPH - 18000) were only sold in Japan, and lacked the expansion bay of later PS2 models . These models instead included a PCMCIA slot . SCPH - 10000 and SCPH - 15000 did not have built - in DVD movie playback and instead relied on encrypted playback software that was copied to a memory card from an included CD - ROM (normally, the PS2 will only execute encrypted software from its memory card; see PS2 Independence Exploit). V3 had a substantially different internal structure from the subsequent revisions, featuring several interconnected printed circuit boards . In V4 everything except the power supply was unified onto one board . V5 introduced minor internal changes, and the only difference between V6 (sometimes called V5. 1) and V5 is the orientation of the Power / Reset switch board connector, which was reversed to prevent the use of no - solder modchips . V5 also introduced a more reliable laser than the ones used in previous models . V7 and V8 included only minor revisions to V6 . </P>

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