EQ-5 Dual Axis Drive for sale.
The hand controller has the st4 port build in and comes with the connections and cable of about 5 mtr and can be straight connected to an parallel port (all electronics are in the hand controller).
This upgrade was done by me and tested working like a treat.
See here for specifications:
https://www.bintelshop.com.au/Product.aspx?ID=7365
Asking $150.00 this includes postage within Australia.