Can someone explain (using e.g. the SELL0GrummiteMadnessOre40 list from Shivering Isles) how the game will choose which item will appear on a given dead enemy?
From what I can see it uses the "chance none" to determine the chance of nothing appearing at all but I dont get what the flags mean or how it chooses which item to spawn if it does spawn one.

I believe it rolls a random number (or a series of them) and uses that to determine what entry on the list (if any) appears.