3-wire stepper motor? need help on understanding.

Hi all,

So I was able to find a salvaged stepper motor from a laser printer,
and think I have figured out the 13 wires coming out of it.
I disassembled it and found the following:

3 wires are for the electromagnets ( I assume a center tapped coil).
there are 6 coils on the PCB within the motor case.
8 wires are for the Hall-effect sensors ( 2 for sensor power and 6 for
sensor pull-off, 3 hall-effect sensors placed 120* apart)  They look
like tiny white squares.
then there is some sort of rounded  square-wave pattern formed into a
circle on the back of that pcb. there are 2 wires for that.

Soo, all the stepper motors I have come into contact thus far have just
been the 4-wire variety, and this is just throwing me for a loop.

Anyone have any idea how this should work?  I put an ohm meter to the 3
leads, and no matter which combo I do, they are all within 2-3 ohms of
eachother.

Any help on this subject would be appreciated.

Thanks,
-Ben