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One of the first things you notice about the PC Jr. when you go to crack it open is that there are no screws on the outside of the case.
I wonder why all the manufacturers decided to go with cases shut tight with screws in the 20 years or so after this PC was on the market.
The Serial Number and pertinent FCC Regulation information for our particular IBM PC Jr. We don't have a modem in ours so the second regulation does not apply.
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)