The latest articles on DEV Community by Fatafat321 Developer (@fatafat321developer). https://dev.to/fatafat321developer https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4161181%2Fac64f477-8c9c-4670-a92f-e4d12468cf31.jpg https://dev.to/fatafat321developer en Fatafat321 Developer Sun, 04 Oct 2026 08:22:51 +0000 https://dev.to/fatafat321developer/i-built-fatafatos-81-on-my-phone-2ogc https://dev.to/fatafat321developer/i-built-fatafatos-81-on-my-phone-2ogc <p>Hi, I am Fatafat321 Developer from Hyderabad, Telangana, India.</p> <p>I built FatafatOS 81 - Tiranga Edition, India's lightest OS.</p> <h3> What is FatafatOS 81? </h3> <ul> <li>50MB only, boots in 2 seconds</li> <li>Built entirely on phone in Termux</li> <li>Files: boot.asm, boot.c, kernel.c, kernel.h, linker.ld - all from scratch</li> <li>Tiranga theme desktop + PIN Lock + Taskbar</li> <li>Own file formats: .fata, .fsw, .fsl</li> </ul> <h3> Why I built it? </h3> <p>India has 140 crore people but no own Operating System. That fact hit me hard. So I decided to build one. Fatafat is a pure Indian word meaning fast.</p> <h3> My Journey: </h3> <ul> <li>Started with handwritten 14-page C book</li> <li>Learned Assembly + C on phone</li> <li>Built bootloader with 55AA signature</li> <li>Built kernel in NASM</li> <li>Made ISO bootable in VirtualBox &amp; Limbo Emulator</li> </ul> <h3> Other Projects: </h3> <ul> <li>3-Player UNO game with real cards + HTML version with bot referee</li> <li>Fatafat321 Official Website (lightweight HTML only)</li> </ul> <h3> Links: </h3> <ul> <li>GitHub: <a href="https://github.com/fatafat321developer/FatafatOS-81" rel="noopener noreferrer">https://github.com/fatafat321developer/FatafatOS-81</a> </li> <li>Website: <a href="https://Fatafat321-developer-official.vercel.app" rel="noopener noreferrer">https://Fatafat321-developer-official.vercel.app</a> </li> <li>YouTube: <a class="mentioned-user" href="https://dev.to/fatafat321developer">@fatafat321developer</a> </li> </ul> <p>I am Fatafat321 Developer, 17, building Made in India tech.</p> <p>Feedback welcome! Should I make FatafatOS 81 fully open source?</p> <h1> osdev #showdev #madeinindia </h1> osdev showdev india beginners