OK, got the card. The middle sized chip on the upper edge turns out
not to be an 80186 or any other processor. It's an Intel C8207 dual port
dynamic ram controller.
The EPROM is an Intel D2764. It has "TEST ROM" written on it in
pencil. It was a bit of a disappointment - first 256 bytes contain bytes
1 to FF, then a 0, then 16 more 0's, then 4096 FF's, then 0's until the
end of the EPROM. No code to be found in there....looks like it was
just something for the card to test reading.
Next I'll load it into a PRO 380 and see if it can be read/written.
I'm not actually too optimistic it will do anything without the missing
Lee K. Gleason N5ZMR