Flycast Dat
Flycast is based on the current MAME romset. You can make the lists on-line.
In the Arcade Database, go to the “Games” section.
Select “Additional Filters” and in the “Driver” tab type “Atomiswave”.
It will be listed, when selected it will be shown as “awbios;”
“Search” button all are shown, to have only Parent, the Show clones option is deactivated.
Export the list is in the “Options” button, there are several options, select the one that suits you best.
The bios you need to create the lists per system...
Atomiswave: awbios
Naomi 1: naomi, hod2bios, f355dlx, f355bios, airlbios
Naomi 2: naomi2
You can select all of them to make a single Arcade Flycast list.