1 Feb 2021, 23:29

@NewKid To find out if the BIOS is the problem, just go to Recalbox's internal BIOS checker and check.
To find out if the problem is the core, do the test by changing the core and see if the problem persists.
It may be the ROM, do not disregard this possibility.

It has no direct relationship, but see if it helps:
https://forum.recalbox.com/topic/22882/impossible-de-lancer-un-jeu-dreamcast-sur-pi4