xt/370 e-mail problem and stacked memory chips illustrated

Are you sure about that? Nick Tredennick, the architect (or maybe co architect) of the 68000 left Motorola, went to work for IBM, and was the architect of the "micro 370". The design and its evolution were described in a book Tredennick wrote, Microprocessor Logic Design: The Flowchart Method. I know nothing of the machine you have there, but I suspect it is really using redundant copies of the micro 370 described in the book. I've heard passing reference to this machine and have heard that it is a 68000 CPU with modified microcode, but that isn't the case. They have similarities at some level because of the era they were design and because of Tredennick's contribution to both. Perhaps you are write and there was more than one micro 370 project, but I thought I'd mention the piece of the puzzle that I know a little about.