---
format: "aidr-story-markdown/v1"
id: "3b8361d079acb9cc9e2ee8bd73fe85c871bc0d1656139f30c46b718d61040471"
canonical_url: "https://aidr.today/3b8361d0?lang=en"
title: "dbreunig/nesformer"
lang: "en"
requested_lang: "en"
available_langs: ["en","vi"]
translation_fallback: null
fallback_fields: []
published_at: "2026-10-30T21:59:22.000Z"
category: "Open Source"
topics: ["llm","open-source"]
source_urls: ["https://simonwillison.net/2026/Oct/30/nesformer/"]
summary: "Drew Breunig created a working Nintendo Entertainment System 6502 CPU emulator embedded within the weights of Qwen3.5-4B, allowing NES ROMs like Super Mario Bros to run inside the model."
---

# dbreunig/nesformer

> [Open the canonical story](<https://aidr.today/3b8361d0?lang=en>)

**Published:** 2026-10-30T21:59:22.000Z
**Category:** Open Source
**Topics:** llm, open\-source

## Summary

Drew Breunig created a working Nintendo Entertainment System 6502 CPU emulator embedded within the weights of Qwen3\.5\-4B, allowing NES ROMs like Super Mario Bros to run inside the model\.

## Sources

- [Story source](<https://simonwillison.net/2026/Oct/30/nesformer/>)