I find something strange:
with the unibios this is the error so in 008CE8:
and in mem:
We can see in 008CE8: 4e71
and it's fun because many protection's patchs in MAME use this value
I think it can't be a coinsidence but I don't know what does it mean
4E71 is "No Op" / NoP / Do nothing
If you want to remove something in 68xxx processor code, use that patch.
4E75 is "Return to Sub" / rts / stop the current function (kind of)
Just for shits and giggles, try this patch with that game.
mem16[0x8CE8 / 2] = 0x422D;
mem16[0x8CEA / 2] = 0x27EC;
mem16[0x8CEC / 2] = 0x422D;