Sony has also made a PVR/DVD burning consumer device that plays PlayStation 2 games called the PSX.
It is backwards compatible with older PlayStation (PS1) games, allows for DVD Video playback, and will play PS2 games off of cheap CD-ROMs or higher-capacity DVD-ROMs.
As of V4 everything was unified into one board, except the power supply.
It was not until late 2001 that the Microsoft Xbox became the second console with (non-standard) USB and DVD support.
PS2's opening day console sales eclipsed the previous record of 225,000 made by the Sega Dreamcast in 1999.
Only a few million users had obtained consoles by the end of 2000 due to manufacturing delays.
One of them includes the old EE and GS chips, and the other contains the newer unified EE+GS chip, otherwise being identical.
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