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The circuit board in the parallel port expansion module is fairly standard.
Although there is a strange white chop on board. Anyone care to take a guess on that?
Here is the IBM PC Jr. all cracked open.
The PC Jr. holds a special place in my heart as my first IBM-based PC. Although I quickly out grew it, this version of the IBM personal computer served me well that last semester of business school where I had to produce several term papers. There is nothing like being able to pull an all-nighter from the comfort of you own living room rather than the school computer lab.