Here's CBBS v3.5 (Yes, THAT CBBS) for your enjoyment.

http://www.simpits.org/~geneb/cbbs35_disk1.zip
http://www.simpits.org/~geneb/cbbs35_disk2.zip

It used to be on the BBS software repository at bbsdocumentary.com, but it
looks like Jason restored an old backup that didn't have it available.

g.