I'm 12 years old and I wrote a 16-bit OS in Assembly (Ariona OS v2)

Hi everyone!

My name is Fedor. I'm 12 years old and I've been learning low-level programming for a while. Yesterday I finished the second version of my hobby OS called "Ariona OS".

It's a 16-bit real-mode operating system written entirely in x86 Assembly (NASM).

Features:

• Custom bootloader (reads kernel from disk via BIOS int 0x13)
• Text-mode UI (VGA)
• Keyboard input handling (BIOS int 0x16)
• Simple menu system (with 2 working options: App Engine and Shutdown)
• Works in QEMU and on real hardware (80386+ / 1.44 MB floppy)

Codebase: ~150 lines of pure assembly for the kernel + bootloader.

This is my first step into OSDev. I know it's very basic (just real-mode), but I'm proud of it and I want to learn more.

My next goals:

1. Switch to Protected Mode (GDT, A20)
2. Add a simple keyboard driver (without BIOS)
3. Write a FAT12 reader

GitHub repository (MIT license): https://github.com/bro732965-oss/ArionaOC

I would be very grateful for any feedback, advice, or code reviews. If you see any mistakes or bad practices, please tell me — I want to get better!

Thanks for reading!