Steve is basically right, and the reason why you can't get past the split screen is because you can't eat enough dots to advance to the next board. If you set MAME pacman with infinite lives, you can actually clear the split screen because 9 dots reappear after you die, and eventually you eat enough of them to advance. Of course this is cheating, so there is no legal way you can do this.(posted 9683 days ago)In Dig Dug, you get to round 256 (it shows as zero) then that's it. Finito. You start the round with a pooka on your head and all your men die in succession.
There is a lot of misinformation on the internet about Dig Dug and Pacman (remember the books that said there was gold and silver bars in Pacman?) but now we know the rumours are just not true.
Mark