2-pin spindle connection on the back goes to a JST on the PCB located low down, between the fan and the toroidal. That PCB also has the parallel port and USB port on it, so I'd suggest its just a case of identifying that PCB and finding a manual to determine the pins.

GeneO, can you see any markings on the board in the middle of your first photo? The one that sits right behind the fan. I'm looking for a model name, number, manufacturer. Something like that. There seems to be some writing above the handwritten label on it, but its hard to make out from the photos.

Looks to me like a low power DC spindle, so the exact RPM is going to be a bit subjective.