Wasn't the original Dramamine actually Meclizine,
No.
Or at least it's been dimenhydrinate since I started paying attention to that sort of thing in the early 80's. The original brand names for meclizine were Antivert for the prescription version and Bonine for the OTC.
and the original Benadryl actually Diphenhydramine?
Yes. It still is. The newish "less drowsy formula" is meclizine.
Woody