Originally Posted by neurotix
The retrobit handhelds would be good if you didn't already have something that can emulate old systems.
For me personally, I have two modded PSPs and both are pretty much fantastic for emulators.
There's also the (old) Korean GP2X and Wiz, as well as smartphones, and probably other devices.
Someone needs to make an add on controller thing that you can stick on the side bottom of a phone, so it ends up looking somewhat like the PSP Go. Basically a piece of plastic with a D-Pad and buttons with a section that slides underneath the phone and attaches. Phones have pretty good emulators but terrible controls if you're using the touch screen. Maybe there's something like this already, I don't know.
I have some bluetooth controller thing that phones snap into...it works OK, I guess. Honestly, I never use emulators on my phone/tablet...tried them all out just for the heck of it, but I don't really game on the go. I think the pad I got is a Moga Pro or something. It's decent, but dedicated handle-helds are still a far better experience. Run into compatibility issues when pairing, games not liking it, losing connections, short battery life, ****ty buttons and psp-esque analog stick, etc. And the Moga controllers are supposed to be one of the better brands. Also, I actually bought a cheap bluetooth keyboard/keypad with plans to hack it into something like you described there, but just never got around to it.