Probably less than most:
NES:
Castlevania
Castlevania II
Castlevania III
GB:
The Castlevania Adventure (JP)
Castlevania II: Belmont's Revenge (JP)
SNES:
Castlevania IV
PC Engine:
Rondo of Blood
PS1:
Symphony of the Night
Chronicles
Saturn:
Symphony of the Night
GBA:
Circle of the Moon
Harmony of Dissonance
PS2:
whatever the first one is called. I have the JP verison and it is just called "Castlevania"
PSP:
Drac X Chronicles
DS:
none, but I play them all on my R4 chip happily
Used to own, but sold:
FDS:
Castlevania
Castlevania II
Famicom:
Castlevania III
Mega Drive:
Bloodlines (JP)
Super Famicom:
Dracula XX: Rondo of Blood