Emulating the 6502

Conceptual Summary

The 6502 is an 8-bit microprocessor that was widely used in early personal computers and game consoles (Apple II, Commodore 64, NES). Emulating the 6502 involves implementing its instruction set, addressing modes, and timing behavior in software.

6502 Architecture

The 6502 features:

• 8-bit data bus, 16-bit address bus (64 KB address space)
• Three 8-bit registers: Accumulator (A), X, Y
• 8-bit status register (flags: N, V, B, D, I, Z, C)
• 16-bit program counter (PC)
• 8-bit stack pointer (SP)
• 56 instruction opcodes
• 13 addressing modes

Emulation Approach

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Instruction Set

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Addressing Modes

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Timing and Cycles

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