How do you convert an ATX power supply to use with RAMPS 1.4?

The RAMPS 1.4 board comes with a 4-pin screw terminal for power, how can I convert my ATX power supply to work with my RAMPS board?


This is a companion discussion topic for the original entry at https://reprage.com/post/43759806705/how-do-you-convert-an-atx-power-supply-to-use-with