This is the radeon 8500 links page
Note: If you downloaded the bioses zip file then you probabably have all bioses on the websites below
How to volt mod card (not necessary on later cards)
More bios and driver downloads
More bioses and ATItool (artifact tester) and helpful forum
Ati bios/card version lookup (useful to double check what the bios was intended for)
Bioses for cards other than built by ATI
Badly flashed ati bios forum help thread