A wont slave to Y w/external drivers

Machine: DIY 32"x32"

Board:Laserboard

Firmware: Smoothie or GRBL-LPC

Problem/ Question: I am running dual Y axis steppers with external drivers. I moved the mapping jumpers as instructed in this post per the photo [I need to slave the A drive to my duel X motors How?](http://Slave axis)

The A axis will only respond as an A axis regardless of position of the jumpers. I also loaded GRBL-LPC and it acts the same.

Is there something in the Config that needs to be modified to slave A output?

Right - that only slaves the onboard drivers. If you want to slave external drivers just connect both drivers to the Y output - jump the connections from one driver to the other and it will do what you want.

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