MetalliC
Champion
MAME sources have short summary: we have no idea how DC/Naomi checksum protection algorithm works, we only know how it triggered and how to check final result.
I was only able to hacky bypass it using magic data chunk from HOTD2 proto BIOS, but we still cant do whole 2MByte BIOS with valid checksum (required to make all Dreamcast software to work fine).
btw, BIOS checksum hardware protection is the ONLY protection present on DC or NAOMI mobos (besides external devices like GD drive or carts). this year turned out 20 years to DC/NAOMI, and it still not reverse engineered or (really) cracked.
PS: if it was not clear from googling - p1pkin and MetalliC is single person, me lol
I was only able to hacky bypass it using magic data chunk from HOTD2 proto BIOS, but we still cant do whole 2MByte BIOS with valid checksum (required to make all Dreamcast software to work fine).
btw, BIOS checksum hardware protection is the ONLY protection present on DC or NAOMI mobos (besides external devices like GD drive or carts). this year turned out 20 years to DC/NAOMI, and it still not reverse engineered or (really) cracked.
PS: if it was not clear from googling - p1pkin and MetalliC is single person, me lol
