Ms.Pac covers a lot of games, pretty standard frequency and refresh.
Try Mr.Do (or any other Universal game), it has a much smaller screen with a much lower refresh that often causes monitors to go out of sync, provided you are driving the monitor natively like with AdvanceMame (or some regular builds of Mame with powerstrip)
Try a MCR based game like Kickman, Tron, Tapper or an Astrocade game like Gorf or also Popeye They run in interlace mode at a higher resolution and again can cause monitor sync issues if running with AdvanceMame.