WinVICE is a Commodore emulator that lets you run Commodore 64, VIC-20, PET, etc programs on your modern computer. I prefer an older version (2.4) the most as I feel newer versions have too many extra features that I don't require.
I am also interested in Bulletin Board Systems (BBS), and I'd like to set up WinVICE on an older computer and run a Commodore BBS on it. One item has gotten in my way: any versions of WinVICE that I use will not report the presence of a modem carrier tone to the BBS software (DCD). [More]