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Inspired by Divyansh Agrawal's qwenputer, Drew Breunig wrote a runnable NES 6502 CPU emulator into the weights of Qwen3.5-4B, and it can now run NES ROMs such as Super Mario Bros. in Qwen (very slowly). In a Hacker News comment, he disclosed the prompts used to build the system with Opus 5.5, noting that Opus found and used the NES CPU conformance test suite published by Christopher Pow 15 years ago.
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Drew Breunig writes a NES emulator into the Qwen3.5-4B weightsDevelopments
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Drew Breunig embeds an NES 6502 CPU emulator into Qwen3.5-4B weights
Source:Simon Willison
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Oct 31
Simon Willison
Drew Breunig writes a NES emulator into the Qwen3.5-4B weights
Inspired by Divyansh Agrawal's qwenputer, Drew Breunig wrote a runnable NES 6502 CPU emulator into the weights of Qwen3.5-4B, and it can now (very slowly) run NES ROMs such as Super Mario Bros inside Qwen. In a Hacker News comment, he disclosed the prompts used when building the system with Opus 5.5, noting that Opus found and used the NES CPU consistency test suite that Christopher Pow published 15 years ago.
Hacker News · dbreunigRelated discussion
Hacker News · dbreunig joined this discussion
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