I've been able to get the following games working on my ipaq 3850...
Asteroids
Donkeykong
Mario Bros (US)
Zaxon (set 1)

Defender (Red Label) started but wouldn't play
I tried lots and only had luck with these few. However none of them had sound. They worked on both mamece3 and mega mamece3.
Has anyone had any luck with other ones.