I've got a PRT Alpha 96 that I picked up new in 2006. I've been getting more into CNC stuff lately and I'm in the process of building a PrintNC CNC machine - this got me thinking about using a grblHAL2000 on my ShopBot.

I was able to get the controller pinouts from SB and found that the controller supports 14 inputs and 14 outputs. Is there a reason someone hasn't installed an additional end stop switch so an auto-squaring routine could be written?

Thnx!

g.