Watch Skill
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It is the clearest public case that an agent with good reference code and a conformance suite can produce something exact, because the result is diffed against a real emulator.
nesformer puts an NES central processor inside a language model. The 6502 core, two kilobytes of work RAM and a cartridge's program ROM live in the weights of a stock Qwen3.5 checkpoint, which predicts the processor's execution log one token at a time. A small Python host draws frames, reads the controller and fires the vblank interrupt. It runs mapper-0 cartridges, and the bundled test games match a conventional emulator frame for frame, at 150 to 290 times slower than real hardware. Drew Breunig says Claude Opus wrote it from two prompts. MIT.
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