So I ohmed out these odd connectors and each pair, or triplet, are connected together. The top of the connector is a bit spongy, so I tried stabbing the male end of a Dupont connector into one. And it works, and it holds nicely. They don't go in very far (I took the top off and looked, and they are ...
I didn't get any notifications of your responses, I looked for the email notifications, but I couldn't find them. Ah, now I see it, I needed to check it in the full editor.
Concerning the trainer, I took it to Phreaknic in Murfreesboro last weekend and opened it up and ohmed it out a ...
Update: I did some researching and found this book:"Microprocessor Concepts and Applications" ISBN 0-86657-005-5, which covers the usage of the trainer, as well as having a hard copy of the Monitor in the appendix. However, it does not cover the add-on boards.
I stumbled across one of these trainers complete with the frame (case?) which includes the power supply. It came with four boards as seen in this post: