All the PSPs are made to be compatible with each other.
The PSP 1000, 2000, and 3000 will all be able to run the same offical software, and firmware updates.
Sony wanted to make sure that all PSP users will be able to enjoy games no matter what version of the PSP they have.
While some games may use newer features, such as the built in microphone, this doesn't stop PSP 1000 and 2000 users from playing as they can just go out and buy one.
Newer games might load faster on the PSP 2000 and 3000 than the 1000 due to ram, but this doesn't stop 1000 users from playing.
Adding something like a touch screen or a second analog stick would prevent 1000 and 2000 users from using games designed to use the features presented in the 3000.
This would limit their market and in the end cause them to lose money.
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