DreamBoot is a custom bios made for the Sega Dreamcast. The bios allow booting homebrew apps from an sdcard or hard drive, with a few more useful stuff inside (todo: more information…).
You’ll find a very few more information and a download link on the github project page.
Dark Mode
dreamboot (this link opens in a new window) by Cpasjuste (this link opens in a new window)
A custom bios / bootloader for the dreamcast