Thanks for your reply.
I am using USB, and I enclose photos of the board. It is "MACH3 controller for mini CNC" and I have versions 1.3 and 3.1. They look basically the same.
If I use drufel CNC
it shows the board USB number. I am told the Drufel does not have the M3/M5 delay, but I doubt it.
It looks as if output1 is active, and this might be the laser. I will try your file and let you know.
Are there any MACH3 setting I should know aboit? I have tried them all with M3 and M5.
I would love to get a manual for the board, and even a schematic: 2 boards blew up and I changed the regulator, but I could then find out why.
Thanks for your help.
Lawrence