When I got mine, I got asked this question:

"Data East ran two configurations for the display board and some had 1x display rom and some had 2x.

The new code is burnt on to 1x rom chip, so if you currently have two on your display board, then you will have to change a jumper on the board for the new rom. I can provide instructions for this if we need to do it."

Did you confirm this?

a pair should have come. One for the display board and one at the board in the back box

Mate you'll love it when you get it in. Completely turns the way you play upside down.

Multi ball is really hard to get as you're not spoon fed it and the modes give you a reason to play for points instead of stacking them for system failure

It kicks my arse now and can barely crack 400 mill