[PDF] 6502 machine code

  • Is 6502 still made?

    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.

  • Is the 6502 open source?

    6502Asm - James Salvino's 6502Asm is an open-source (GPL-licensed) assembler written in Python that supports the NMOS 6502 instruction set. A6 - Simon Collis has written a multiplatform 6502 cross-assembler geared towards Commodore 64/128 development.

  • 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 strictly an 8-bit architecture, with a single 8-bit accumulator register, and can access a maximum of 64K bytes of random access memory. Memory addresses are exactly 16 bits in length, because 216 = 65536 = 64K. Valid addresses range from 0 up to 65535.
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