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→X, Indirect
An 8-bit zero-page address and the X register are added, without carry (if the addition overflows, the address wraps around within page 0). The resulting address is used as a pointer to the data being accessed. Note that, effectively, this makes the X register an index into a list of pointers.
LDA ($05,x); if x=4, then the pointer at $09 (and $0a) will be used, and the accumulator loaded from the address indicated by the pointer
== Indirect, Y ==