6502 emulator online


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  • 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.

  • What are the registers of 6502?

    The 6502's registers include one 8-bit accumulator register (A), two 8-bit index registers (X and Y), 7 processor status flag bits (P; from bit 7 to bit 0 these are the negative (N), overflow (V), reserved, break (B), decimal (D), interrupt disable (I), zero (Z) and carry (C) flag), an 8-bit stack pointer (S), and a 16

  • The 6502 does a memory access in the second half of every ø0 clock cycle, even when it doesn't need to.
    This is important to understanding the internals and some of the quirks of the instruction set.
    Other signals associated with memory accesses are: R/W which the CPU sets high to read and low to write.

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