I'm not sure if this has been discused here already but while reading an article on Retroblast website about someone selling older gaming systems and handhelds, I started thinking about a game I used to love back around 1980 or so, and I finally tracked down the name and found that they had an simulator for it.
The game was called Dungeons & Dragons Computer Fantasy Game by Mattel and I used to carry that thing with me all day long, I loved it and it was great to get a chance to play it again after all these years.
Check out the website below, looks like many classic handhelds are emulated here...
http://madrigal.retrogames.com/dnload.htmlYou will probably have to go to his mirror site that is in Italian as Nintendo threatened him with a lawsuit.
Hope you enjoy.
Allister Fiend