Anyone have info on a EDH687C31?

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This is a hybrid made by Electronic Designs Inc. long ago.  The firm that bought
them out has not responded to my request.

It is a 40 pin device, has 8k x 8 EPROM and 8k x 8 RAM, don't know much more
about it.

What I want to do is read out the ROM and then be able to reprogram it.

I need:
    Pinout
    Reading and programming info
    What specific Mot 687 series processor based on?


Any help would be MUCH appreciated!

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