ErikZalm/Marlin — pull request #603 by shaggythesheep (2013-09-17 18:24:32+00:00)
Title: Added Y_DUAL_STEPPER_DRIVERS

Enables two stepper drivers to be used for the Y axis (useful for
Shapeoko style machines)
Each Y driver can be stepped either the same way or in opposite
directions, accounting for different hardware setups (leadscrew vs. belt
driven)