I think that you'll find your graphics card is unsupported, but you may be able to force a resolution by putting graphics mode into com.apple.Boot.plist.
As for your audio, someone correct me if I'm wrong but I think your best bet would be AppleAzaliaAudio.kext in which you will probably have to find out and insert your device id.
Failing that you could try teruga's patcher which you'll find on insanelymac and a linux dump file, but not sure if it works for 880.