The first Castlevania game (Castlevania duh) was released on the
PC in 1990 you can probable find it on either amazon or Ebay or you
could get Konami Collector's Series: Castlevania & Contra which
was released nov 16,2002 which comes with Castlevania, Castlevanis
II Simon's Quest, and Castlevania III Dracula's Curse it also
includes Contra and Super Contra