Y Index Register

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The Y index register is an 8-Bit data register inside the MOS 6502/6510 CPU.

The Y index register is used in the Indirect Indexed, and Absolute indexed by Y addressing modes.

Also used in conjuction with the Accumulator (A) to form either memory address locations (A/Y) or 16-Bit signed values (A/Y) for Floating point arithmetic.