Ok, I'll break down step 2 more.
1) Item's droprate is d, which is typically approx. = 0.00005 (for equips), or about 0.5 (for etc.)
1.5) If you have a 2x drop card (apparently) Multiply d by 2.
2) Generate a number r between 0 and 1 randomly (every programming language will have a function for this, they use various mechanisms but generally it would be synchronized across the server so what someone does at the other end of Maple affects your luck)
3) Check if r < d
3.5) If there's a 2x event, repeat step 2 and do (r1 < d || r2 < d) // this step is broken... 2x events don't work
4) If it is true, drop the item.
Some bosses can drop the same item twice (Zakum, for one). This is handled by repeating the item. As far as I know, Zakum tries 5 times for helmets, and however many are successful, you get that many. Rate seems to be about 0.4 for each...
1) Item's droprate is d, which is typically approx. = 0.00005 (for equips), or about 0.5 (for etc.)
1.5) If you have a 2x drop card (apparently) Multiply d by 2.
2) Generate a number r between 0 and 1 randomly (every programming language will have a function for this, they use various mechanisms but generally it would be synchronized across the server so what someone does at the other end of Maple affects your luck)
3) Check if r < d
3.5) If there's a 2x event, repeat step 2 and do (r1 < d || r2 < d) // this step is broken... 2x events don't work
4) If it is true, drop the item.
Some bosses can drop the same item twice (Zakum, for one). This is handled by repeating the item. As far as I know, Zakum tries 5 times for helmets, and however many are successful, you get that many. Rate seems to be about 0.4 for each...