The coprocessor that was originally sold as a companion in the wildcard is specific to it. I believe its called the D8087-3 for the 4mhz revision 1 cards also known as leading edge non-E cards. I found one D8087-3 being sold in the russian federation for 2800 USD in January, but I need the D8087-4 which isnt even in the wiki or cpu world. Its for the Leading Edge E model, which was a wildcard that ran at a little over 7Mhz. Yes there are 8087 and C8087s but neither works in a wildcard 88.
I have bought two leading edge systems since March and unfortunately neither had a 7Mhz revision 2 but ONE had a coprocessor, so now I do have a D8087-3, alas it doesnt work so no sweet Kia Optima for me. Still, it has maybe 2k in value, It's hard to judge and I am wholly unwilling to see what happens to one on ebay.
Because of how the processor was made, essentially a glued on die straight to a fiberglass PCB...it is incredibly susceptible to failure simply by handling as they have aged. It's sad, as this was one of the most unique efforts Intel ever undertook in those days and paved the way for system on chip designs later on.
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