If you are looking for custom firmware for the popular Anbernic handheld device, these are the two most popular community OS choices.
🔗 https://dosbox-x.com/
The primary appeal of the site lies in its interface. Upon visiting, users are greeted with a choice of classic operating systems, such as Windows 95 or Windows 98, rendered entirely within their modern web browser. For older generations, it is a nostalgic trip back to the "startup sounds" and pixelated icons of their youth. For younger users, it provides a hands-on history lesson, showcasing the aesthetic and functional limitations of the software that paved the way for today’s sleek interfaces.
While DOSBox is famous for games, is a more accurate emulator for running operating systems that rely on legacy BIOS, floppy drives, and VGA graphics. It can boot OS/2, Windows 95, PC/GEOS, and even some Linux floppy distros.