Yes the pin numbering is reversed when compared to Mach3 manual, so the actual numbers are 2,4,6 and they are measuring at 0/3.3 volts depending on which (+/-) key is pressed. No idea what voltage the pins were at under W2000, I will have to check with computer shop as to whether XP or their repair might be responsible. It certainly ran reliably under W2000. I have not determined which pin controls spindle speed.
Malcolm- who is going out for the evening.