John Deere grain drill calculator card

I use a DF john deere grain drill. It is double run, not fluted feed. It is a 20x8 and it has the fertilizer as well as the grain boxes. I can't find the calculator card for it. JD says it's obsolete. Does anyone know where I can find a calculator card for it, or at least borrow one? The manual doesn't have the settings in it. There isn't any chart inside the drill lid.

You can develop your own card if you have the patience. The old cards may be off somewhat since fertilizer is now palletized unlike the old stuff. It could feed different with the new fertilizer. For either seed or fertilizer arrange to catch one or more of the tubes with a bucket or buckets. Start with the lowest setting and first pull the drill a short distance to get uniform feed. Then place the empty bucket and pull the unit through a know distance which can be measured after the fact. A longer distance and multiple tubes collected will yield more accurate results. Weigh the seed or fertilizer and calculate an application rate in pounds per acre and record along with the setting. Increase the setting and repeat until you exceed any application rate you ever expect to use. Plan on measuring 5 or 6 or more settings. Plot the points on a graph to interpolate between measurements. If you do not find a card and the math seems too involved, send me an email and I will try to walk you through.
We never did depend on the cards or tables to completely establish drill settings. You still have to keep up with how much was actually applied on a know acreage and verify that the setting was correct. You can also do it by trial and error if you put a measuring wheel on the drill and determine the actual application rate for a given setting or you could also consider planting a know acreage and measuring as accurately as possible the pounds applied.