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

TL;DR

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A developer has released a BASIC interpreter that boots natively on UEFI machines. This development demonstrates a low-level, minimal environment for programming directly on modern hardware, blending retro computing with current standards.

A developer has created a BASIC interpreter capable of booting directly on UEFI systems, a breakthrough in low-level programming environments for modern hardware. This project, shared on Show HN, demonstrates how vintage programming languages can be adapted to contemporary firmware standards, offering a minimalistic environment for experimentation and education.

The project, named Thoreau BASIC, is a self-contained interpreter designed to run during the UEFI boot process, bypassing traditional operating systems. The developer, who remains anonymous, aimed to recreate a classic BASIC environment—complete with line numbers, immediate mode, simple graphics, strings, and arrays—on modern hardware that uses UEFI firmware instead of legacy BIOS.

According to the developer, the implementation is lightweight and designed to demonstrate how low-level firmware can support a programming environment typically associated with vintage computers. The interpreter is written in low-level languages suitable for UEFI development, such as C and assembly, and is capable of initializing during the UEFI boot sequence, offering a minimal but functional BASIC environment before an OS loads.

The project is open source, with the code available publicly, and has garnered interest from enthusiasts of retro computing, firmware hacking, and educational technology. The developer emphasizes that this is primarily a proof of concept, showcasing the potential for more complex, hardware-agnostic programming environments at the firmware level.

Potential Impact of UEFI-Level BASIC Interpreter

This development matters because it demonstrates that even modern firmware environments like UEFI can support custom programming languages and environments traditionally associated with older hardware. It opens possibilities for low-level programming, firmware experimentation, and educational tools directly on contemporary systems without relying on an operating system. For enthusiasts, it provides a glimpse into how vintage computing concepts can be adapted for modern hardware, potentially influencing future firmware development and security testing.

Retro Computing Meets Modern Firmware Standards

Historically, BASIC was a popular programming language in the 1970s and 1980s, often used as an introductory language for new programmers. Its environment typically ran on early personal computers with BIOS firmware. As systems evolved, BIOS was replaced by UEFI, a more advanced firmware interface with stricter security and hardware management features. Despite this, hobbyists and developers have long sought ways to run vintage environments on modern hardware.

This project builds on the tradition of retro computing, where enthusiasts create emulators, virtual machines, or direct hardware modifications to run old software. However, creating a BASIC interpreter that boots directly on UEFI firmware is a new step, as UEFI’s security model and modular design make such low-level programming more challenging. The developer’s work demonstrates that it is feasible to run custom code at the firmware level, even on modern secure systems, which has implications for both hobbyist experimentation and security research.

“Thoreau BASIC is designed to run during the UEFI boot process, providing a simple, vintage-style programming environment before any OS loads.”

— Developer (via Show HN post)

Limitations and Security Implications Still Unclear

It is not yet clear how stable or secure this UEFI-based BASIC interpreter is, or whether it could be extended to support more complex programs or hardware interactions. The developer notes that the project is primarily a proof of concept, and further testing is needed to evaluate its robustness and security implications, especially in production or security-sensitive environments.

Future Developments and Potential Applications

The developer plans to refine the interpreter, improve its stability, and possibly add features like file I/O or hardware interfacing. There is also interest in exploring how such firmware-level environments could be used for educational purposes, firmware hacking, or security research. Additionally, community feedback may lead to adaptations for other firmware standards or hardware platforms.

Key Questions

Can this BASIC interpreter run on any UEFI-compatible machine?

It is designed to work on systems that support UEFI and meet certain hardware specifications. Compatibility may vary depending on firmware implementation and security settings.

Does running code at the UEFI level pose security risks?

Potentially, yes. Running custom code during the firmware phase can bypass operating system protections. The developer advises caution and recommends using such tools in controlled environments.

Is the project open source?

Yes, the code is publicly available, allowing others to review, modify, and experiment with it.

Could this approach be used for malicious purposes?

While technically possible, the project is intended for educational and experimental use. Security implications depend on implementation and deployment context.

What are the practical applications of a UEFI-based BASIC interpreter?

Uses include firmware hacking, low-level programming education, hardware diagnostics, and security research. Its primary value is in demonstrating firmware flexibility.

Source: hn