I got a ULN2003-based stepper driver board like this one:
http://www.ebay.com/itm/ULN2003-Driver-Module-Stepper-Motor-Driver-Board-/121060748096?pt=LH_DefaultDomain_0&hash=item1c2fc86b40
Right below the chip there are 4 pins: GND, VCC and two labelled with this symbol: <-> The board arrived with a jumper on the ones with the symbol. I can find no documentation about the pins or the jumper. Any ideas?
The only then is to trace where the links go. It is possible that it is a link to the flyback diodes on pin 10 of the chip.
The jumpered pins on the ULN2003 is for a switch that would stop the stepper from running. Think of it as a local disconnect.