Serial to usb

[Themainproblem]

Hello everyone,

I'm trying to run a terminal emulator for dos written in 1991. It's used for packet radio and communicates with a type of radio modem called a TNC. The TNC is looking for a serial input and I would like to use a raspberry pi3 to do the work of an xt. Would it be possible to do this? Is Faux86 already capable? Thank you.