These are 2 pages scanned from the instruction booklet that comes with the PS 150 Selector

This was originally designed to be used with the Singer 150 Bulky machine which is a 9mm machine.
But...I have used it with my Brother 230 machine too.
Also it is designed to use 12 stitch punchcards, but 24 stitch punchcards will roll through it too, but it only selects every other hole so many punchcards will produce very different patterns, all you can do is examine them and try the patterns out.
It functions very much like the Jac 40's.
You can punch your own cards for this using regular 24 stitch punchcard blanks, they will work just fine, just punch every other hole.