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At the link below are pictures of the Exidy produced S-100 card that I believe to be part of the Exidy I/O Expansion Kit. I don't have any details other than pure speculation because the card has no components on it. I think it's supposed to be a bridge board to an S-100 chassis that would be equivalent to the S-100 Expansion chassis.
Any clues are much appreciated. Here's the link: http://vintagecomputer.ca/the-exidy-sorcerer-mystery/