Simple Bootloader

A minimal x86 bootloader written in Assembly.

This project is part of my low-level programming journey and is designed to help me understand how the PC boot process works, from BIOS to Real Mode execution.

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✨ Features

• Written in x86 Assembly (NASM)
• Boots in 16-bit Real Mode
• Uses BIOS interrupt 0x10 for screen output
• Prints a simple message to the screen
• Compatible with QEMU
• Educational project

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🎯 Learning Goals

This project is built to explore and understand:

• The PC boot process
• BIOS services
• x86 Real Mode programming
• Memory layout during boot
• Bootloader fundamentals

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📖 Article

• 🇬🇧 English: Building a Bootloader from Scratch
• 🇮🇷 Persian: اولین تجربه من در دنیای Low-Level Programming؛ ساخت اولین Bootloader

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📁 Project Structure

simple-bootloader/
├── src/
│   └── boot.asm
└── README.md

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🚀 Getting Started

Follow these steps to build and run the project on your local machine.

📦 Prerequisites

Install the required tools:

Ubuntu / Debian

sudo apt update
sudo apt install nasm qemu-system-x86

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📥 Clone the Repository

git clone https://github.com/Nebez-Berzency/simple-bootloader.git
cd simple-bootloader

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🔨 Build

Compile the bootloader using NASM:

nasm -f bin src/boot.asm -o bin/boot.bin

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▶️ Run

Boot the generated binary with QEMU:

qemu-system-x86_64 -drive format=raw,file=bin/boot.bin

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🗺️ Roadmap

• Boot from BIOS
• Print text using BIOS interrupt 0x10
• Print colored text
• Handle keyboard input
• Explore additional BIOS interrupts

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📜 License

Copyright (c) 2026 Nebez Berzency

Licensed under the MIT License.

Feel free to use, modify, and learn from this project.

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Keep coding. Keep building. 🚀