an addy surrounded by nops is a routine, it is something that is written into the game to load the addys/values and call them por say when you hit a button ( a joker)
easiest way is to get the code out of the routine, port the code, then remake the routine..
about DMA's..
lets say it looks like this
#US Y-Coords
0xFFFFFFFF 0x00505858
0x0000001c 0xc2660000
you port the address 00505858, then you find how far away from the ported address, the code is that you want the effects.
so i would port 00505858, then go down until i can find my Y coordinate.
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