Logan Carrillo has released ds-claude-terminal, a homebrew application that transforms Nintendo DS family consoles into wireless clients for Anthropic's Claude Code. The project decouples the heavy liftingβ€”running the LLM sessionβ€”from the interface, allowing users to monitor code changes, approve edits, and type prompts from a handheld device with a 67 MHz ARM9 processor and just 4 MB of RAM.

Technical Constraints and Architecture

The client is written in C using BlocksDS, bypassing standard operating systems to render a 42Γ—24 terminal grid on the top screen. The server component, written in Python, utilizes pyte to emulate the terminal and streams only changed cells to minimize bandwidth. Every message is constrained to a single 536-byte TCP segment, the hardware limit of the DS's Wi-Fi module, ensuring the interface remains responsive despite the ancient hardware.

Security and Connectivity

Carrillo implemented a rigorous security model suitable for public networks. The system uses X25519 key exchange for pairing, requiring users to verify a six-digit code on both screens to prevent man-in-the-middle attacks. Once paired, every frame is encrypted with ChaCha20 and signed with HMAC-SHA256. The DS acts strictly as a keyboard and display; it cannot execute commands or read files independently, mitigating the risk of remote code execution from the handheld.

User Experience Features

The interface includes tactile feedback for critical actions. When Claude requests permission to edit a file or run a command, the DS screen turns yellow and emits a beep, prompting the user to press 'A' to approve or 'X' to reject. The bottom screen serves as a control hub, displaying session status in plain language and offering a touch keyboard for typing prompts. For DSi and 3DS users, the app even supports live camera input, allowing photos to be injected directly into the Claude context.

Key Takeaways

  • The project supports DS, DS Lite, DSi, and the entire 3DS family, though it is currently only tested end-to-end on a DSi.
  • Installation requires a one-time softmod or flashcart for the console and a Python server running in tmux on the host computer.
  • The server supports macOS, Linux, and Windows (via WSL2), with a dedicated 'dsterm doctor' command for troubleshooting.
  • All cryptographic implementations were cross-checked byte-for-byte between the C client and Python server against RFC test vectors.

The Bottom Line

This is a masterclass in resource-constrained engineering. While the utility of coding on a dual-screen handheld is debatable, the technical execution proves that modern LLM interfaces don't require expensive hardwareβ€”they just need a clever protocol and a developer willing to fight 20-year-old memory limits.

Current Status

The project is MIT-licensed and available on GitHub. While the core functionality is stable on the DSi, support for original DS and 3DS hardware is based on documentation rather than physical testing. Carrillo is actively seeking installation reports from users with these older consoles to verify Wi-Fi stability and rendering performance across the full hardware spectrum.