I have seen some BBS's actually Z ;-)
Back in the early days when I first had Internet (I was actually like 7-10 I think), it was how I got baseball scores, and discussed how to hack IRC ;-)
My father was the head of Information Tech. at a Secondary school, so we had dialup access through Research Machines (UK). First you had to dial the school, then from the school server dial RM, and when you hung up, if you forgot to hang up the first connection before doing your own, the school got a huge phone bill ;-)