Gents,

Something of interest, well maybe.

Having the suggestion of testing the parallel port on my PC I downloaded Parallel Port Viewer and installed, so I dont know what the pins do or mean my a couple of point of interest.

Without selecting anything and with Mach3 running I pressed the X+ key (left arrow) to see pin 1 change to on and off when X- (right arrow) was selected. So I thought this was giving an actual account of what the pins were doing.

Also when C5 was selected in the PPV screen (screenshot shown) then all the motors buzzed louder, engaged type noise. I dont know it this is significant. Also with C5 (1) C3 (0) C2 (1) C1 (0) and C0 (1) all 6 LEDs i on the board were lite. Again I dont know the significance of the LED's.Click image for larger version. 

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