for basic drops (energy, missiles, "nothing") always keep the formula in mind
(FF-super-pb)/(small+big+missile+nothing)*(current item) and then truncate
rate is zero for anything samus is full for, as the game does not load that drop
this is how the game scales unneeded drops into other ones
any remainder becomes nothing drops for unused RNG values at the top
 
 
for advanced drops (supers, PBs) they ALWAYS drop at the listed rate if you need them, at RNG values after all the basic drops
if it's a mixture of basic and advanced needed, a remainder can cause nothing drops to push advanced drops down slightly from the top
otherwise, advanced drops are always at the top
 
 
health alarm: if the critical health flag is set (set when drop spawned <30 HP, unset when drop spawned while >50 HP)
the game only loads small and big energy drops
if both >0 and add to an even number, an RNG value of FF will give nothing
otherwise, in vanilla all enemies with drops can drop energy, so everything that drops items will guaranteed drop energy
 
 
gamet (norfair 5x reload bug) base rates:
3C/3C/3C/05/3C/0A
se/be/mi/--/su/pb
 
health alarm case:
01-7F small energy (FF/(3C+3C)*3C)
80-FE big energy (FF/(3C+3C)*3C)
FF nothing
 
trivial need everything case:
01-3C small energy
3D-78 big energy
79-B4 missile
B5-B9 nothing
BA-F5 super
F6-FF power bomb
 
trivial only need pbs case:
01-F5 nothing  (FF-0A)/05*05 just gives (FF-0A)
F6-FF power bomb
 
don't need pb ammo:
01-3F small energy (FF-3C)/(3C+3C+05+3C)*3C gives a rate of 3F
40-7E big energy
7F-BD missile
BE-C2 nothing (FF-3C)/(3C+3C+05+3C)*3C gives a rate of 05
C3-FE super
FF nothing
 
full on supers:
01-4F small energy (FF-0A)/(3C+3C+05+3C)*3C gives a rate of 4F
50-9E big energy
9F-ED missile
EE-F3 nothing (FF-0A)/(3C+3C+05+3C)*3C gives a rate of 06
F4-FD power bomb
FE-FF nothing
 
missiles already topped off:
01-58 small energy (FF-3C-0A)/(3C+3C+05)*3C gives 58
59-B0 big energy
B1-B7 nothing (FF-3C-0A)/(3C+3C+05)*3C gives 07
B8-C1 power bomb
C2-FD super missile
FE-FF nothing
 
full on energy and super:
01-E2 missles (FF-0A)/(3C+05)*3C
E3-F4 nothing
F5-FE power bomb
FF nothing