John they come with an SD-70 file. That is ok if you are putting the board in a diesel. Not so good for a steam engine. Remember, MTH sent us the list of chain files to be used in the PS32 boards a long time ago. I know you do not care for the PS32 board but my experience has been one hundred percent. I have done a large number of them with no issue. What I do love is using the PS2 3V sound files. I believe those are also the files you favor. I am fortunate as most of the people in my area with bad PS2 3V boards point them in my direction. When I get a bunch together, they go to George (GGG) down in Virginia.
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