Sonic Rivals 2

[Vyperii]

Hi, I'm really new on here, not tried PSP emulation before as I didn't even know it could be done... pleased to see it seems to be coming on fine.

But anyway, I wondered if anyone could help me please?

The emulator boots up perfectly- I have been trying to run Sonic Rivals 2 but with limited success. The sound and menus all work perfectly. However, when you access the gameplay some strange effects are observed. The game plays upside down! Still to the right, but upside down- there are four black lines across the screen also, evenly distanced which cover around a third of the screen...
The foreground UI- rings, lives, etc. are all the right way up though. The game appears to be running very nicely in the background- the graphics are perfect- It's just obviously having lines through the screen and an upside down playing field ruins the experience somewhat. Does anyone know how to fix this?

Many thanks for any help.