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The IBM PCjr, or PC Junior, is an important artefact in the history of the modern personal computer.
The PCjr was IBM's attempt to enter the SoHo (small office/home office) market. In 1983, the largest computer company in the world was looking to tap a fast-growing segment that it had not foreseen as even existing just a few years before. By most objective accounts, IBM failed.
However, that is not to say that the IBM PCjr was a complete failure. Most owners of the machine considered it to be a wonderful success; unfortunately, they were few in number.
Talkback
I remember this piece of shi... err underperforming bag of nonsense.
All that non-standard connection periphery was a precursor to the "new standard" - PS/2, that similarly fell on its err.. bottom.
IBM continued to try and con the public and exploit its dominant position, The PC Junior was just one example of this attempted manipulation, and was the first of many bloody noses, dealt by the market to the smug face of IBM.
IBM tried to force its dealers (I was one of them) to take pallets of these at risk of losing their dealerships. We lost ours, and made a mint selling Compaqs.
Brian M