running another emulator inside PPSSPP

[xy1331]

Hello, I have a jailbroken iPad 4 running 8.1.2 and am wondering if anyone knows whether it's possible to use an emulator for the PSP like Castaway or Atari800 from within PPSSPP. I downloaded both emulators' files and copied them over my iPad's PPSSPP \PSP\GAMES directory. I can launch both emulators from within PPSSPP but they don't seem to get very far.

Atari800 just seems to hang after I launch it, and then in about 10 seconds or so crashes PPSSPP and takes me back to the iPad desktop.

Castaway launches but then never brings anything like an AtariST desktop up where I can insert games disks or anything.

Has anyone heard of any success stories running another emulator inside PPSSPP?

As you can tell I really just want to be able to play Atari 8-bit and Atari ST games on my iPad somehow. I could also go the Amiga emulation route instead of Atari ST if that's possible.

Thanks for any help!