>hacking on BBS source code in Pascal
Was it Telegard? WWIV was originally in Pascal but by the time I got to it, it had been rewritten in C++. Telegard was built off the Pascal version of WWIV (if I'm remembering right). There was another BBS based off WWIV in Pascal, but I don't remember the name.
https://en.wikipedia.org/wiki/Telegard
I started on a Commodore 64 and C-NET BBS then was gifted a PC in late 1990 and WWIV was the closest thing with source code. We had a pretty decent modding community for both C-NET and WWIV. Good times.