This is a modem emulator. It supports all of the standard Hayes commands. You could select 19200-57600 baud and use JR-Comm and other terminals.
I could look at making a SANA II driver. I do have some info from when I supported these drivers with EMPLANT and FUSION.
I think the PET user port is not the same as the VIC-20 and C64/128's user ports.
A sanaII driver will make this usable as a internet connection as well, and not only for BBS etc usage?