Unfortunately, not all 770 apps run on the 800. This is one. The hardware is different. And any app that runs on the 770 but not OS2006 definitely won't run on the 800.

There are some apps that work on both platforms... but the developer will usually say so ...

n770 shipped first with Internet Tablet OS 2005, then OS 2006. The 800 has OS 2007. Apparently, the processors have binary compatability, but different video and audio hardware. Seems apps that do sound or high level graphics are unlikely to work...