Simon Willison· 工具· 2026年10月31日 05:59

Drew Breunig 在 Qwen3.5-4B 权重里嵌入 NES 6502 CPU 模拟器

原标题：dbreunig/nesformer

Drew Breunig 受 Divyansh Agrawal 的 qwenputer 启发，把一个可运行的任天堂 NES 6502 CPU 模拟器烧入 Qwen3.5-4B 的权重，可以直接运行 Super Mario Bros 等 NES ROM，但速度非常慢。他在 Hacker News 评论中公开了用 Opus 5.5 构建该系统的提示词，包括阅读 qwenputer 文章、评估用模型权重模拟芯片和内存、确定所需模型规模等步骤，并提到 Opus 找到并使用了 Christopher Pow 15 年前发布的 NES CPU 一致性测试集。项目地址：https://github.com/dbreunig/nesformer。

为什么值得看

原文指向可下载的模型权重和 CLI，还附上构建该系统的完整提示词思路，读者可以自行复现这个实验。

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原文

30th October 2026 - Link Blog

dbreunig/nesformer (via) Inspired by qwenputer by Divyansh Agrawal, Drew Breunig baked a working emulator for a Nintendo Entertainment System 6502 CPU into the weights of Qwen3.5-4B. You can now play NES ROMs such as Super Mario Bros (very slowly) running inside Qwen!

In a comment on Hacker News Drew reveals the Opus 5.5 prompts he used to build this system:

Read this article and any relevant source code: https://divagr.com/blog/qwenputer. Then explore if you could emulate the chip and ram in a Nintendo Entertainment System (as people do today with FPGAs in MISTRs) using this technique. If so, what size model would you have to build and if you could use smaller faster ones, could you get it to be at the standard clockspeed.

Followed by:

I think we should build it! Just for fun. It's okay if it's not fast. We want to be able to have the weights, and a cli to run them that we can point at a ROM.

Apparently Opus found and then used this collection of conformance tests for the NES CPU released 15 years ago by Christopher Pow.

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