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

A developer has successfully built and demonstrated a BASIC interpreter that boots directly on UEFI firmware. This achievement allows vintage-style BASIC programming environments to run natively on modern computers, bypassing traditional operating systems. The project, shared on Show HN, aims to revive classic programming experiences on current hardware, highlighting ongoing interest in low-level programming and system hacking.

The developer, who goes by the username ‘Thoreau’ on Show HN, detailed how they wrote a minimal BASIC interpreter capable of executing on UEFI firmware without relying on an operating system. The project involves a custom UEFI application that initializes hardware, loads the interpreter into memory, and runs BASIC code directly. The implementation supports line numbers, immediate mode execution, simple graphics, strings, and arrays, mimicking the behavior of vintage BASIC environments.

This approach leverages UEFI’s ability to run applications at boot time, which is a departure from traditional OS-dependent environments. The developer emphasized that the interpreter is lightweight and designed for educational and hobbyist purposes, illustrating how modern firmware can host legacy programming environments. The project is open source, with code available for others interested in exploring low-level programming or building similar bootable environments.

Implications for Retro Computing and Firmware Hacking

This development demonstrates that it is possible to run vintage programming languages directly on modern hardware using UEFI firmware. It opens opportunities for hobbyists, educators, and embedded system developers to experiment with low-level programming without needing an operating system. The project also showcases the flexibility of UEFI, which is increasingly used for custom boot environments beyond its traditional role in OS bootstrapping. Additionally, it highlights a trend of pushing the boundaries of what firmware can do, encouraging further exploration of system hacking and legacy environment revival.

Background on UEFI, BASIC, and System Hacking

UEFI (Unified Extensible Firmware Interface) has largely replaced BIOS in modern computers, providing a more flexible and programmable interface for system initialization. While UEFI is primarily used to load operating systems, it also supports running applications directly at boot time, enabling custom firmware-level programs.

Vintage BASIC, originally popular in the 1980s, was a simple programming language environment used on early personal computers. It featured line numbers, immediate mode, and basic graphics, making it accessible for beginners and hobbyists. Over time, these environments faded as operating systems evolved, but they remain nostalgic and educational tools for some programmers.

This project builds on the idea of system hacking—modifying or extending firmware capabilities—to run legacy environments directly on modern hardware. Prior efforts have focused on emulators or virtual machines; running BASIC natively on UEFI is a novel approach that leverages the firmware’s capabilities for low-level programming.

“This BASIC interpreter boots directly on UEFI firmware, allowing vintage-style programming environments to run natively on modern hardware.”

— The developer ‘Thoreau’ on Show HN

Technical Limitations and Compatibility Questions

It is not yet clear how broadly compatible the interpreter is across different UEFI implementations or hardware architectures. The developer has tested on specific systems, but widespread adoption or portability remains unconfirmed. Additionally, performance constraints and limitations in graphics or hardware access at this low level are still being evaluated. The long-term stability and security implications of running such code directly on firmware are also uncertain and require further testing.

Next Steps for Development and Community Engagement

The developer plans to refine the interpreter, improve hardware compatibility, and potentially add features like file I/O and extended graphics. They intend to open-source the project, inviting community contributions and experimentation. Future updates may include porting the interpreter to different UEFI firmware versions and testing on various hardware platforms. Additionally, discussions are expected to explore how this approach could be extended to other vintage environments or embedded applications.

Key Questions

How does the BASIC interpreter run without an operating system?

The interpreter is compiled as a UEFI application, which runs directly during the firmware’s boot process, bypassing the need for an OS.

What hardware is required to run this BASIC interpreter?

Any UEFI-compatible machine that supports custom UEFI applications can potentially run the interpreter, though specific hardware compatibility has only been tested on certain systems.

Can this project be extended to support other vintage programming languages?

In principle, yes. The approach of booting directly on UEFI can be adapted to other environments, but each would require custom development and testing.

What are the security implications of running custom UEFI applications?

Running unsigned or unverified UEFI applications can pose security risks, so users should exercise caution and verify code authenticity before execution.

Is the project available for public use or contribution?

The developer has indicated plans to open-source the project, inviting community engagement and further development.

Source: hn