Show HN: I Wrote A BASIC Interpreter That Boots On UEFI Machines

A developer has introduced Thoreau BASIC, a BASIC interpreter that boots directly on UEFI systems, eliminating the need for an operating system. This development allows users to run a vintage-style BASIC environment on modern hardware, emphasizing simplicity and low-level control. The project, shared on Show HN, highlights a novel approach to retro computing and system programming.

The developer, who remains anonymous, built Thoreau BASIC from scratch, targeting UEFI firmware rather than traditional OS environments. The interpreter supports core BASIC features such as line numbers, immediate mode, simple graphics, strings, and arrays, aiming to recreate the classic programming experience.

According to the creator, the goal was to develop a lightweight, minimal environment that can run independently on modern hardware, emphasizing educational value and hobbyist interest. The project leverages UEFI firmware to initialize hardware directly, bypassing the need for an OS like Windows or Linux. The implementation is written in low-level languages, likely C or assembly, to interact directly with firmware interfaces.

While the project is still in early stages, the developer has successfully demonstrated a bootable image that loads into memory and runs BASIC code, including simple graphics and input handling. The project is shared openly on Show HN, inviting feedback and collaboration from the retro computing community and low-level programmers.

Implications for Retro Computing and System Programming

This development demonstrates the feasibility of running classic programming environments directly on modern hardware, opening new avenues for educational tools and hobbyist experimentation. It also showcases how firmware-level programming can provide a lightweight alternative to full operating systems, which may appeal to enthusiasts interested in low-level system design.

For the broader community, Thoreau BASIC offers a platform to explore system boot processes, firmware interactions, and legacy programming languages without relying on traditional operating systems. It could inspire similar projects aimed at restoring or recreating vintage computing experiences in a modern context.

However, the project remains experimental; its practical applications are limited at this stage, and it may face challenges related to hardware compatibility and feature completeness.

Background on UEFI and Retro Programming Projects

UEFI (Unified Extensible Firmware Interface) replaced traditional BIOS as the firmware interface for most modern PCs, providing a more flexible and programmable environment for hardware initialization. Unlike BIOS, UEFI can run applications directly from firmware, enabling projects like bootloaders and lightweight operating environments.

Retro computing enthusiasts have long sought ways to run vintage programming languages and environments on modern hardware, often through emulators or dedicated hardware. However, few projects have successfully booted a simple interpreter directly via firmware, bypassing an OS entirely. Previous efforts have focused on emulation or virtual machines, but this project aims for native hardware execution.

The developer’s approach builds on existing knowledge of UEFI application development, which typically involves writing in C or assembly and interfacing with firmware protocols. The project aligns with recent trends toward minimal, firmware-based computing environments, emphasizing control and simplicity.

“My goal was to create a small, self-contained environment where BASIC could run directly on hardware, without needing an OS. UEFI provides a perfect platform for that.”

— The developer

Technical Limitations and Compatibility Concerns

It is not yet clear how broadly compatible Thoreau BASIC will be across different hardware configurations. The project currently supports specific UEFI firmware implementations, and hardware differences may pose challenges. Additionally, the completeness of the BASIC interpreter—such as graphics capabilities, input handling, and file I/O—is still being developed. The developer has not yet published detailed technical documentation or source code, so the full scope and limitations remain uncertain.

Upcoming Development Milestones and Community Feedback

The developer plans to refine Thoreau BASIC, improve hardware compatibility, and expand features such as file management and advanced graphics. They also intend to release the source code publicly, inviting community contributions. Future updates may include porting to additional firmware types or developing a toolkit for creating similar firmware-based interpreters. Engagement from the retro computing community will likely influence the project’s evolution, potentially leading to more robust and versatile implementations.

Key Questions

Can Thoreau BASIC run on any UEFI-compatible PC?

It currently supports specific hardware configurations, and compatibility across all UEFI systems is still being tested. Users should expect some hardware-specific adjustments.

Is the source code available for modification?

The developer has indicated plans to release the code publicly, but it is not yet available. Once released, it will be open for community contributions.

What are the practical uses of this project?

Primarily educational and experimental, allowing users to explore low-level system programming and vintage computing environments without relying on traditional operating systems.

How does this compare to emulators or virtual machines?

This project runs directly on hardware via firmware, offering a more authentic experience and potentially better performance, but with more hardware compatibility challenges than emulators.

What are the main technical challenges faced?

Ensuring hardware compatibility, supporting full BASIC features, and developing a robust boot process are ongoing challenges for the project.

Source: hn