Based on my own and others' research
SystemID NES
00F9 b u 0 RAM RNG Value
0226 b u 0 RAM Hero Pos X1
0213 b u 0 RAM Hero Pos X2
025F b u 0 RAM Hero Pos Y1
024C b u 0 RAM Hero Pos Y2
006A b u 0 RAM Hero Life
006B b u 0 RAM Hero Magic
006C b u 0 RAM Hero Keys
008D b u 0 RAM Hero Money x1
008C b u 0 RAM Hero Money x2
0096 b h 0 RAM Hero Score x1
0095 b h 0 RAM Hero Score x2
0094 b h 0 RAM Hero Score x3
0093 b h 0 RAM Hero Score x4
0092 b h 0 RAM Hero Score x5
0091 b h 0 RAM Hero Score x6
000B b u 0 RAM Hero State 1
000F b u 0 RAM Hero State 2
0013 b u 0 RAM Hero State 3
0014 b u 0 RAM Hero State 4
02BE b u 0 RAM Hero State 5
030A b u 0 RAM Hero State 6
007D b u 0 RAM Hero Jump State
00CB b u 0 RAM Boss 1 Health
00C8 b u 0 RAM Boss 2 Health
00C9 b u 0 RAM Boss 3 Health
00CA b u 0 RAM Boss 4 Health
0227 b u 0 RAM Attack X1
0214 b u 0 RAM Attack X2
0260 b u 0 RAM Attach Y1
024D b u 0 RAM Attack Y2
0042 b u 0 RAM Current Room
0043 b u 0 RAM Previous Room
0001 b u 0 RAM Is Lag Frame
0061 b u 0 RAM Game Timer
00F1 b u 0 RAM Inventory Egg
000A b u 0 RAM Game Mode