V10 and V11 have minor changes.
The ability to play DVD movies allowed consumers to more easily justify the PS2's relatively high price tag (in October 2000, the MSRP was $300) as it removed the need to buy an external DVD player (indeed, it could be said that the success of the DVD format was partly due to the PS2's ability to play DVDs, as the format seemed to appeal more to consumers after the console's launch).
Sony has also made a PVR/DVD burning consumer device that plays PlayStation 2 games called the PSX.
As of V4 everything was unified into one board, except the power supply.
Developers also complained that it was difficult to develop for the system, with little in the way of reference material from Sony for its exotic architecture.
This allowed the PS2 to tap the large install base established by the PlayStation.
Yet, the PS2 initially sold well solely on the basis of the strength of the PlayStation brand and its backwards compatibility, selling over 900,000 units in the first weekend in Japan.
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