Well worth updating the ROM's.  I purchased a ROM burner a while back to help out with my machines and my local buddies.

Fairly easy job to swap them over (you'll loose your high scores) but just be super careful removing and installing the new ROM.  Easy to bend / break pins but follow Ken's instructions and he will point you in the right direction.

If your batteries have not been changed in a while, good time to do it or install a remote battery holder.