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One of the interesting and unique features of the PC Jr. was the side panel expansion system.
Here we are looking at the expansion panel for a parallel printer port. My personal PC Jr., all those years ago, had a 128KB RAM expansion board. (That's right, a whopping 256KB of RAM total)
The plastic door of the expansion pops right off to reveal several screws and another port of an additional expansion if you so wished.
These screws are a bit of a wild goose hunt. They only apply to the expansion card and they are double set screws. By that I mean, the first part of the holds the expansion card to the case and the second part holds the expansion card together. But we'll get to that later.