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In need of an 8-phase stepper motor driver

I have two Responsyn HDM-185-2000-8 Stepper motors that drive a 20" telescope.  

The motors specifications are Wiring: 8 phase, 9 wire, Rated Current per phase 0.875 A (Total 3.5 A).

The motor operation provides 4000 steps per revolution in Half Step mode.  

Logic Sequence (CW):

Pin 1 = D!

Pin 6 = B!

Pin 2 = C!

Pin 7 = A!

Pin 3 = D

Pin 8 = B

Pin 4 = C

Pin 9 = A

Pin 5 (power)

 

The Half-Step Sequence:

1.... A C B D..................................

2.........C B D..................................

3.........C B D A!..............................

4.............B D A!..............................

6.............B D A! C!.........................

7.................D A! C! B!......................

8.....................A! C! B!........................

9.....................A! C! B! D!....................

etc.

Does anyone know where I might find one?