Orin,
Looks like a small Sherline lathe tilt mounted. Looks like it has stepper motors and must have some type
of power supply / drives for the motors. The x axis will be operated with a reverse tool post as compared to
a front tool post ( but depending on the travel you should be able to use front toolpost if you desire).
I suggest you download the Mach TURN manual as i will refer to it by page or chapter and contains much of the
info you will need to know.
You will need a computer along with the appropriate operating system ( page 2-2 ) along with MACH loaded on it.
Mach utilizes the PP port and sends the signals out to the drives via PP cable. So you will need to modify / provide for the cable hookup at the lathe box / somewhere and run wiring correctly to the drives or some kind of breakout board. You need to find information about the drives and how they should be wired as you will be defining what and where pins go to and from . Just an high level overview see chapter 4 for specifics.
Basically you need a computer , software, cable, and some rewiring to utilize Mach talking as a "conventionally" set up lathe.
Mach will not run in DOS , and the on board computer is DOS based according to very brief look at site info. I know nothing about the RHINO on board computer so i won't speculate.
Maybe someone else will post and provide a different way to do it.
Hope this helps,
RICH