Light machine CNC

I got a good price on a Light Machines CNC mill/Lathe. I have the
controller box, but not the pc card. I figure I'll have to buy some
more modern electronics to drive this little cuttie. BTW It uses a
Sherline mill/lathe. I have one of the steppers off of the machine. It
has 8 pins, but when I looked at the controller cable, which plugs on I
noticed that they only used 4 pins in the plug. I also don't know the
voltage these steppers run at. My two questions for the list are;

Why use only 4 of the possible 8 pins and how do I check out this
stepper to see what kind of controller I need to drive them.

Any links would be appreciated.

I f you like you can see my you tube videos of this machine in 2 parts.
http://www.youtube.com/watch?v=c0O5ftXhliY
http://www.youtube.com/watch?v=cgV4b0C_eN0
Watch in HD if you got the band width.

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~~~********************Alex Fraser********************~~~
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