The Dreamcast BIOS is the most basic software chip built into the Dreamcast, it is responsible for managing the basic hardware settings and boot configuration. There is no real reason why anyone would wish to create a BIOS from scratch or significantly modify the existing firmware.
Dreamcast emulators require a BIOS file in order to act like the system, however they do not include this software because it is copywrited. In order to use a Dreamcast emulator you need to extract the software from an existing physical Dreamcast unit by use of a serial coder cable.
Dreamcast BIOS dumps are not legally redistributable. You must dump them yourself from your own Dreamcast.
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There are no dreamcast emulators that will run dreamcast ROMs. The dreamcast is cd-based, so you can either download an emulator like Chankast, and use actual dreamcast CDs (you can get them for a couple of dollars/pounds) or download dreamcast ISOs
Yes Sega still makes games but not necessarily for DreamCast. The leaders at Sega realized that they can't compete with the other major players in the console market. So they switched to making games and phased out the console for the Dreamcast. The games they create are made primarily for the other game consoles. The Japanese market may still be open to game production for Segas Dreamcast.
The Dreamcast cannot emulate itself, however, it is possible to obtain a Dreamcast emulator for a PC. Various emulators, such as Chankast Alpha, exist.
No a Dreamcast game will not play on your computer but just putting the disc in there. You would have to play a dreamcast game on a dreamcast system.
Dreamcast Collection happened in 360.
Dreamcast Collection was created on 2011-02-22.
They can only play games that are designated for the dreamcast.
You only play Dreamcast games like Sonic Adventure on your Sega Dreamcast instead of Sega Saturn.
They stopped making Dreamcast Consoles in 2003.
Dreamcast was created on 1998-11-27.