Game Genie    To      Raw Address

ABC-DEF-???           (reversed F)CDE=AB



(example for Spider-Man GBC)

641-7DF       To      017D=64
64B-78B       To      4B78=64



Reversed list

0 to F
1 to E
2 to D
3 to C
4 to B
5 to A
6 to 9
7 to 8
8 to 7
9 to 6
A to 5
B to 4
C to 3
D to 2
E to 1
F to 0