Have you considered playing a MUD? If the systems can't handle the graphics required by most MMORPG's, then the text based MUD's might be a good choice. Check out http://www.mudconnector.com/ to search hundreds of MUD/MUCK/MUSH sites. You can search according to criteria and find suitable games. Most of these are free, too, which can't be said for the graphical games.
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Have you considered playing a MUD? If the systems can't handle the graphics required by most MMORPG's, then the text based MUD's might be a good choice. Check out http://www.mudconnector.com/ to search hundreds of MUD/MUCK/MUSH sites. You can search according to criteria and find suitable games. Most of these are free, too, which can't be said for the graphical games.