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Checking the external supply was going to be my next question! I am not very experienced with Mach3 but the first thing I would check is that the pins were all correctly defined as output and not...

Should the parallel setting not be EPP? I may be completely off base but I thought that there were subtle differences and that EPP was for non printer/scanner peripherals whereas ECP was.

Slightly at a tangent but I set up a Dell Optiplex 960 to run with LinuxCNC recently (4 core CPU). The initial numbers were horrible, 170000ns jitter on the 25us base thread. Adding the kernel...

Why not just make a loop back connection on the remote end from TXD to RXD and see if you can send data back to the original host?