dbreunig/nesformer

Drew Breunig has embedded a working emulator for the Nintendo Entertainment System’s 6502 CPU into the weights of the Qwen3.5‑4B language model, allowing NES ROMs such as Super Mario Bros to run—albeit slowly—directly within Qwen. The project builds on inspiration from Divyansh Agrawal’s qwenputer and uses Opus 5.5 prompts and a 15‑year‑old NES CPU conformance test suite to validate the emulator. Breunig invites exploration of whether smaller, faster models could achieve standard NES clock speeds and encourages community participation in building a CLI to run ROMs with the embedded weights.

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