Original Grappler schematic:


The ProGrappler manual doesn't have schematics unfortunately.


I was doing a little bit of circuit tracing on the ProGrappler and two of the data lines are swapped I think. I'll have to check because I can't remember exactly.

According to my notes:

"I was looking at the prograppler dump and it looked really horrible, so I thought I'd do some checking on the board with a multimeter,
looks like they did a little bit of "protection" where they swapped d3/d4 and a2/a3 and a6/a7."