Implementing a clear room Z80 / ZX Spectrum emulator with Claude Code

· Salvatore Sanfilippo · Feb. 24, 2026, 6:06 p.m.
Summary
The blog post describes the author's attempt to implement a Z80 emulator and a ZX Spectrum emulator using Claude Code, outlining the clean room methodology they used to ensure that the implementation was original and well-documented. The author analyzes the autonomy of the coding agent in producing high-quality code while adhering to strict guidelines, pointing out the advantages of providing detailed specifications and the importance of integration testing. The experiment explores the capabilities of AI in programming, emphasizing the need for documentation and systematic approaches similar to human coding practices.