The bb1 steppers only have 7 LED positions for the number of credits of credits on the machine. So if you have a penny denom, your max credit limit would have to be 99,999.99. If you work within the limits of the 7 digits, you would need to raise the accounting denom to match your max credit. So if you wanted to have 999,999.90 you would need to setup accounting denom to 10 cents. There's also a caveat that the credit limit may also be limited by jurisdictional or game version, so YMMV. You could just play with the number of digits on the credit limit until you get a credit limit that works best for you.