RML is "Roland Machine Language", as opposed to Adobe's RML Redline Markup Language. It's a lower byte-profile version of G-CODE. It is possible to convert from RML to GCODE and vice-versa with substitution scripts.
Roland RML is used across many of the Roland product lines, including Milling Machines, Engravers, and Printers. The cutters use a customized CAMM-GLIII instruction system rather than RML.
These files are Roland RML documents which are presented here "as-is" for testing under any of the CAM or Printing packages that 3DTechnics provides for Roland Machines.
RML Usage Documents