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The layout is very utilitarian - making judicious use of expansion slots.
It is also very dusty - our poor PC Jr. has obviously been neglected. But it still works - they don't make'em like they used to I suppose.
The 5 1/4 floppy drive in the IBM PC Jr. is remarkable for its size -- it is huge and takes up one whole side of the case.
The other side of the case is more open and includes an open expansion slot for an internal modem.