...but what about forwards compatibility? The only system I know of where this issue comes up is the original Gameboy. As most of you probably know, those black GBC cartridges can actually be played on an original GB, with the only price being a loss of color. And surprisingly few (good) games aren't forwards compatible in this way.
I bring this up because a friend and I were getting into a debate about the best-ever handheld system. I went with GB for the forwards-compatibility, and he said that if that counted, a bricked PSP should win by a large margin. So do you think forwards and backwards compatibility are different enough to consider one but not the other?
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LeBron's Evolution
http://i.imgur.com/Jz4Sn.png