Thanks, got usb working now. All the scsi pins are undamaged and the controller termination has been tried on both auto and on, and there is an lvd active terminator on the end of the cable.
On the hard drives there are two sets of what look like half size jumpers which haven't been set, one on the underside and one on the back, are these supposed to be set to anything? On the 80-68pin adaptor there are jumpers which I have used to set the device ID and synchronous mode.