It was not until late 2001 that the Microsoft Xbox became the second console with (non-standard) USB and DVD support.
This allowed the PS2 to tap the large install base established by the PlayStation.
The PlayStation 2 holds the record of fastest selling video game console ever, 100 million PlayStation 2 units were shipped in only five years and nine months, shattering the previous record of nine years and six months by the PlayStation.
V0 did not have a built-in DVD player and instead relied on an encrypted player that was copied to a memory card from an included CD-ROM (normally, the PS2 will only execute encrypted software from its memory card, but see PS2 Independence Exploit).
Not only did Sony roll out the PS2 online adapter in late 2002 to compete with Microsoft, several online launch games were first party titles such as SOCOM US Navy SEALS in order to show that Sony was supporting this feature actively.
The two versions of the PS2 with an Eye Toy camera.
The PS2 also supports PS1 memory cards (for PS1 game saves only) and controllers (the PS2's Dual Shock 2 controller is essentially a slightly upgraded PS1 Dual Shock).
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.
However the New Slim Silver Models have more issues with playing PlayStation games than the first PS2 revisions.
In preparation for the launch of a new, slimmer PlayStation 2 model (SCPH-70000), Sony had stopped making the older PS2 model (SCPH-5000x) sometime during the summer of 2004 to let the distribution channel empty out stock of the units.
This allowed the PS2 to tap the large install base established by the PlayStation.
