Although a majority of BBS games were indeed written in Pascal, the BBS MUDs tended to be written in C or C++. Most of these were MajorBBS/WorldGroup modules, w

Although a majority of BBS games were indeed written in Pascal, the BBS MUDs tended to be written in C or C++. Most of these were MajorBBS/WorldGroup modules, which (if I recall correctly) only supported C / C++. For conventional BBS's running standard doorgames, there were only a few true MUDs (mostly on the later / post-dial-up time frame) and it varied a bit more, but I can say DoorMUD was definitely written in C++.