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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.
There are four pieces of equipment highlighted (red arrows):
- The floppy disk controller
- The infrared reader for the keyboard
- The RAM expansion (64KB)
- The power supply controller board