[ShadowMarth]

Physical compatibility is out. Movies, shows, music, even games, are ALL being bought online now. If the system is capable of playing the software, it's backwards compatible. That means 4 systems of backwards compatibility, not just 1. C'mon, simple logic here, not a big stretch. When you buy the game data, you own the game, just as if it was a cartridge.

Here, don't just take my word for it. Take Wikipedia's.

http://en.wikipedia.org/wiki/Backwards_compatibility

Examples

* A computer system is backward compatible if it is able to work with software or accessories designed for the system it is meant to replace.
The Atari 7800 is backward compatible with most Atari 2600 games.
The Game Boy Advance is backward compatible with previous Game Boy systems, meaning all Game Boy & Game Boy Color titles are playable on this system.
The PlayStation 2 is backward compatible with the original PlayStation.
The Nintendo DS is backward compatible with Game Boy Advance games only.
The PlayStation 3 is backward compatible with PlayStation 2 games.
The Intel 80486 processor is backward compatible with the 80386 because it can execute programs written for the 80386.
The Xbox 360 is backward compatible with some Xbox games. Support for this function will improve over time.
The Nintendo Revolution will be backward compatible with every Nintendo system. The GameCube discs can go in the Revolution, but older games (NES, SNES and Nintendo 64) will be available through download.

Also, DSdude, who do you know that actually used the backward compatibility of the PS2? That is, if they didn't have the disk read errors that plagued the launch and even later releases. I'm sure people will use the PS2 compatibility since it's not too old, "but that's about it as far as just popping in a game from the previous generation."

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