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The 6502 uses several registers in order to perform calculations. Registers are special pieces of memory in the processor which are used to carry out and store information about calculations. The registers are listed here and link to in-depth pages on each.

Name Abbr. Bytes
Accumulator Register A 1
X Index Register X 1
Y Index Register Y 1
Processor Status Register P 1
Program Counter Register PC 2
Stack Pointer Register S 2