[PDF] 6502 assembly code

6502 assembly is a very low-level language that works specifically for the 6502 microprocessor — a very popular processor from the 1970s. We will begin by  Autres questions
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  • What is 6502 assembly?

    6502 assembly is a very low-level language that works specifically for the 6502 microprocessor — a very popular processor from the 1970s. We will begin by taking a closer look at what assembly exactly is and why we have chosen to spend time learning a variant of it that is almost 50 years old.

  • Is 6502 still used?

    As one of the most widely used microprocessor architectures of all time, the CMOS related form of the 6502 developed by the Western Design Center is still in production today, with an estimated six billion units so far produced.

  • How many opcodes in 6502?

    Of the 256 possible opcodes available using an 8-bit pattern, the original 6502 uses 151 of them, organized into 56 instructions with (possibly) multiple addressing modes. Depending on the instruction and addressing mode, the opcode may require zero, one or two additional bytes for operands.
  • The 6502 is an 8-bit microprocessor that was very popular in the 1970s and 1980s, powering popular home computers such as the Apple II, Commodore PET, and Atari 400/800. The 6502 instruction set includes 8-bit addition and subtraction operations.
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