Quoted from wolffcub:I though I read something like it would display 000001 to represent 1 million and then the remainder of the score 438,150.
This is highly individual to each game / system. Most games just roll the score. Or attempt to, as there may be issues on some games.
I've also seen problems where corrupted RAM would have a value other than zero for the (hidden) 8th digit on a 7-digit display. It shows if the game is prefilling zeros onto the displayed score (Zaccaria games does this on purpose though). Only cure was to roll the set highscore in the setting on and on till it showed blanks instead of zeros.
A roll is a roll.
Changing MPU board will not change a thing.