AI IntelligenceOct 30, 2026Practical Tip
Article
Drew Breunig reportedly used Opus 5.5 prompts to explore and then build an NES 6502 CPU emulator inside Qwen3.5-4B weights.
The prompts first asked the model to read a referenced article and source code, assess feasibility and model size, then instructed it to build the system with a CLI pointed at a ROM.
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AI-generatedSource: Simon Willison
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Source Brief
Drew Breunig reportedly used Opus 5.5 prompts to explore and then build an NES 6502 CPU emulator inside Qwen3.5-4B weights. The prompts first asked the model to read a referenced article and source code, assess feasibility and model size, then instructed it to build the system with a CLI pointed at a ROM.
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Practical Tip
Structure a build prompt in two stages: first ask the model to read the referenced article and source code and assess feasibility (including model size and speed), then follow with an explicit build instruction and the desired deliverable (weights plus a CLI that can be pointed at a ROM).
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