In some markets it also integrates a modem.
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).
Later, Sony gained steam with new development kits for game developers and more PlayStations for consumers.
Only a few million users had obtained consoles by the end of 2000 due to manufacturing delays.
As a result, although Sony and Nintendo both started out late and although both followed a decentralized model of online gaming where the responsibility is up to the developer to provide the servers, Sony's efforts made PS2 online gaming a big success.
A product named HD Connect can be soldered into the unit giving hard drive support though.
To this day, the PS2 holds the record for the most consoles sold in a single day as well as the record for most consoles sold in launch day in America.
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