Are you talking about Vs. Castlevania then? It's basically just a port of the NES game but designed for competitive gaming. Or maybe you're playing a PlayChoice-10 unit.
The game being discussed in this thread is this:
Castlevania The Arcade Part 1
This is straight up the NES version on a coin operated machine. Nothing fancy, but the machine's physical layout is, like, a card table, like old-school pac-man. You have to sit down at it, and are looking down at the screen, which essentially is a table top.
It is not a competitive platform. Just old school, bats flying up from the silhouette of the castle when Belmont goes trecking up to the gate with the huge bat as your first end boss where you really want to hit the candle that has the axe sub weapon in it Castlevania.
I apologize for missing the train, just got a hard on for the old school stuff.