The M65S is the solderable PCB for the Mode SixtyFive keyboard, a sixty-five-percent high-end keyboard sold by Mode Designs.
Make example for this keyboard (after setting up your build environment):
make mode/m65s:default
Flashing example for this keyboard:
make mode/m65s:default:flash
See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.