Blue... support? shield? boards wedged into the original Mac Plus ROM sockets.
https://files.mastodon.social/media_attachments/files/111/843/688/929/731/517/original/8568e4f3de4c8492.jpeg
With the Brainstorm installed, each of the Plus's two ROM chips has a blue... support?... board underneath it sharing pins 1, 14, 15, and 28. I'm not sure what the purpose of these boards is-- none of their pins have any continuity, and removing them has no effect on the Sad Mac I get.
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