If you are looking to enable this feature, here is the step-by-step:
Flycast, being a Dreamcast emulator, needs to mimic the behavior of the Dreamcast's AVM BIOS to run games correctly. The emulator comes with a built-in AVM BIOS, but users can also load an external AVM BIOS file for improved compatibility and accuracy. flycast awbios
Flycast relies on MAME-style naming conventions for Atomiswave games. If you are looking to enable this feature,
Based on your request, it seems you are referring to (the popular multi-platform Sega Dreamcast, Naomi, Naomi 2, and Atomiswave emulator) and the BIOS requirements for Atomiswave games. Based on your request, it seems you are
A notable feature related to the Atomiswave BIOS and Flycast is that Atomiswave games (which run on hardware similar to the Sega Dreamcast) often default to vertical ("Tate") monitor modes because they were designed for arcade cabinets.