two different BBS software on a C-64: HAL9000 and CNET v10 in SoCal from 1983-1986. It started at 300 baud and ended at 1200. It was called The Pirates Galley and later, The Probability Broach. CNET v10 software had lots of basic parts to it, so was highly customizable. For example, the email section was fashioned after the wild west and visiting the old post office. File transfer section was science fiction themed. We only had a few thousand user accounts, but for a single line BBS, that's pretty good. I can still remember the phone number, 805-647-8093. No, don't try it, it's been offline for over 30 years.
I still have the basic portion of the CNET printed out on some dot-matrix printer around here somewhere..good times.