What happens when the PC-FX's backup memory gets full?

[ReyVGM]

I've never played the PC-FX before.

What happens when the PC-FX's backup memory gets full and you try to play a game that uses the backup ram?
Do you get a cool backup full warning screen message like some of those PCE CD games?

In addition, do the PC-FX games also have warning screens like PCE CD games when you don't meet certain system requirements?
For example, the warning screens you get when you load some PCE CD games with the wrong system card.

I know that if you try to play Battle Heat on a PCE CD you get a warning message. Are there any other games that do that too?