NVRAMs should be initialized with 0xff, cause of why
Super Drift Out doesn't initialize it properly. Finding a solution for it...
EDIT: done:
r7795 /src/mess/ (11 files in 4 dirs): Added fill parameter to image_battery_load / image_battery_load_by_name, and fixed SNES NVRAM fill to be 1, fixes Super Drift Out SRAM data Obviously you need to delete any "broken" .nv and probably recompile.