An opcode is a 6502 microprocessor instruction represented as a number and is what is actually executed by the 6502. Typically, you will program using three letter instructions (like INX). When this instruction is "assembled", it is converted to a number, thus becoming an opcode.

To clarify :

  • People write instructions.
  • Which are assembled into numbers (opcodes)
  • Which are executed by the 6502

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