Hello. Sorry for bad English.
I have little idea about PSP games on PS3.

This is minis_logo.png from dev_flash:

Most people remember news about FW 3.15:

This firmware added support PSP minis for PS3. My idea:
Someone who have PSP and PS3 version of one minis application could compare this two versions.
Other idea - someone who have installed minis application on PS3 with backup manager could check how it works.

I think PSPemu folder can be used by PS3 minis application. If we understand diffidence in PS3 and PSP minis application we can make progress with real pspemu.

If someone can, please try it.