BIOS Bootloader - Hello World (NASM)

This is a simple "Hello World" bootloader written in NASM for BIOS systems. It is intended as a minimal example of how to write and test boot code using the x86 real mode and BIOS interrupts.

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🧠 What is a Bootloader?

A bootloader is a small piece of code executed by the BIOS after powering on the computer. Its main job is to initialize hardware and load the operating system — but in this case, it simply prints a message to the screen.

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📜 What It Does

• Loads at memory address 0x7C00 (standard BIOS boot location).
• Prints the message "Bootloader working!" character by character using BIOS interrupt int 0x10.
• Enters an infinite loop after displaying the message.

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⚙️ How to Build

Make sure you have NASM installed.

nasm -f bin bootloader.asm -o bootloader.bin

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🧪 How to Run in QEMU

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