For Sale: Guide Port Interface with Pass-thru
$30 (incl postage within Australia)
"This device plugs into the parallel port of a PC or laptop computer and converts the D4, D5, D6, and D7 data lines into signals that can be used by the guide port (sometimes referred to as a CCD port) of many types of telescopes. An RJ-12 cable is all that is needed to go from the interface adapter to your guide port."
Never been used - bought for a laptop with a printer port, and the laptop gave it up before the unit arrived.
http://www.store.shoestringastronomy.com/gpint_pt.htm
