V7 and V8 are also similar, and V9 (model number SCPH-50000/SCPH-50001) added the Infrared port for the optional DVD Remote Control, removed the widely unused FireWire port, added the capability to read DVD-RW discs, and a quieter fan.
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.
The PS2 launch seemed unimpressive and gaffe-prone, compared to the well-planned launch of the Sega Dreamcast, which was making a genuine attempt to woo developers and which had better launch titles.
There are also some disputes on the numbering for this PS2 version, since there are actually two sub-versions of the SCPH-70000.
Later hardware revisions had better compatibility with PlayStation games (Metal Gear Solid: VR Missons works on most silver models).
V3 has a substantially different internal structure from the subsequent revisions, featuring several interconnected printed circuit boards.
However, the release of several blockbuster games during the 2001 holiday season pushed the PS2 far in front even as the Xbox and GameCube made their impressive debuts.
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