MD Play OK, you probably know about that one (it's one of the many shitty portable MDs that have been popping up in the last years), but you may be interested in this: MD Card Game #1 MD Card Game #2 What do we know about those? For some reason I have the feeling I may have seen those games before...
That's the Firecore Portable, which can apparently run ROMs off SD cards. I wonder if those Tectoy games are undumped MD ROMs.
I'm actually wondering if those are Java games =/ I actually remember seeing some kind of game menu list on one of those portable things that had new games (although crap in general). If I recall correctly, all but a Battle City clone were Java games, or at least hybrid games (I.e. they used some MD "hardware" and some custom hardware). I wonder if it's the same thing? EDIT: and ironically, the Battle City clone seemed to be the only decent one out of that crap =P
AFAIK That's just an SD card full of roms. The MD Play can play any rom from any SD card so that's what I think it is :P