wow this was hard
http://www.modchip.com/
seriously if the only reason you want to mod your ps2 is to run a sega emulator, you can get a dreamcast and run one there for free(it works ok). or just get an xbox and mod that(its much easier to mod, has better emulators, has more apps, and doesnt even require a chip if done right).
Basically I would spend the 50 dollars more to get a used xbox rather than to mod a ps2.
ps2 modding is a bitch and ther is alot to solder.
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