When the PlayStation 2 launched in America in October 26, 2000, Sony sold 510,000 units within the first 24 hours.
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).
A silver edition is available in the United Kingdom exclusively.
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.
V5 introduces minor internal changes and the only difference between V6 (sometimes called V5.1) and V5 is the orientation of the Power/Reset switch board connector, which was reversed to prevent the use of no-solder modchips.
A product named HD Connect can be soldered into the unit giving hard drive support though.
V3 has a substantially different internal structure from the subsequent revisions, featuring several interconnected printed circuit boards.
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