Originally Posted by
SoggyBottomBoy
***UPDATE***
Success! I have connected the 3x AA battery holder to the external battery pins. Positive lead to Pin 1, Negative lead to Pin 4
After consulting with an online group of vintage computer enthusiasts, they were quite sure that after removing the jumper, Pin 1 would be for the positive lead & Pin 4 would be the negative lead of my battery holder. They cautioned that I should make sure that Pin 4 had continuity to ground, and after probing with a volt/ohm meter, I verified that Pin 4 was ground.
I removed the OEM wires from the battery holder, and soldered 12" long Dupont (22 AWG) leads directly to their corresponding points within the holder. Inserted the wire terminals into a 1x4 female connector to push onto the pins, and routed the wires so that the battery case is on the outside of the computer case for easy access for battery replacement.
Now, I just have to figure out how to get into the BIOS to see what needs to be done. I'm not sure if I need to have an external keyboard hooked up to do that, or not. I think the oldest keyboard that I have has a PS/2 DIN6 connector on it, and the control box on the mill has a DIN5 port on the back. Fun, fun, fun!