The original black EQ6 comes in a non-goto and a goto version with synscan. The goto synscan versions work with EQMOD (that's what I have). The cable you need can be made by purchasing a USB-Serial TTL cable and soldering a DB9 plug on it or you can buy a cable already made up - see this thread:
http://www.iceinspace.com.au/forum/s...ght=dontronics
http://www.dontronics-shop.com/ftdi-...ter-cable.html
http://www.starstuff.com.au/page56a.html