AnalysisAI ModelsOctober 30, 2026

Drew Breunig bakes NES 6502 emulator into Qwen3.5-4B weights

Read original source →simonwillison.net

Inspired by Divyansh Agrawal's qwenputer, Breunig got Super Mario Bros ROMs running inside Qwen3.5-4B — very slowly. He used Opus 5.5 prompts to build it, and the model found a 15-year-old NES CPU conformance test suite by Christopher Pow.

People · Drew Breunig

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