Put it in your EPROM reader/writer, and compare it to the rom file it's supposed to be.
i have a tl866 ii plus and use xgpro as software, i should select an eprom type before i can do any action.
as i red on neogeo dev wiki the sm rom has the same MX27c1000A pinout but when i do any action on sm1 rom the software give me pin detect error.
EDIT: If i deselect pin detect and check id flags from software options i have a mismach at address 0x0001 0000, buffer value 0x f3, chip value 0x FF and in total 63377 difference quantity