I know of several very different PDP-11 BBS's using very disparate 
architectures. Some were run on RT-11 or RSTS-11 entirely inside a BASIC 
program that managed every element of call answering, logging in, and 
disconnection. And others took advantage of TSX-11, RSX-11 and RSTS-11 login 
security and "captive accounts" that were either entirely menu-driven or had 
restricted command sets, with the menu options or command sets oriented 
strongly towards typical BBS functions.

I know Billy Youdelman's TSX-11 BBS in LA was operating in the 1980's and 
1990's and may have gone on longer than that.

Tim N3QE

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