Okay, since you'll probably want to know what's new with Zx-81'a PSP2600 Atari 2600 emulator for the PSP, we'll cut right to the chase. It has the multiple keyboard mapping feature (thanks to Pou-chan) from the PSPAtari emulator v1.0.6, but more importantly, PSP2600 sports a new graphics engine that runs off the PSP GU for rendering purposes.

• Is it faster? Sadly, no - for this, the "soft render" modes from older versions of PSP2600 are still available, as they work faster.
• But is it smoother? Oh, yes. Zx-81 says in the changelog a lot smoother.