I can't believe it ...or possibly I can. After working over the past 12 months to sucessfully integrate my ATC into Mach3, with untold hours of support from various community members, the thing has now packed in 
Not sure if there is just one of the solenoids that has stopped working but I suspect it was the original Denford ATC circuit board/processor as the status LED doesn't change when I send either good, or deliberatley bad, code.
Hey ho, looks like I will have to start again and bring all the manual switches back to a I/O card and directly control them from the PC.
Very depressed and disillusioned.

...Sweep