Fixing up a Viper Night Drivin for a friend, and it never had an original mpu due to battery acid damage. Bought a rotten dog replacement, the two 68B09E, BSMT2000, and wanted to double check the types of chips that are used for the roms. I have a 27512 at U7, and the rest are 27C040. Can anyone confirm this? I have the 27c040's but need track down the other.