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Oddly enough, that huge floppy drive is not bolted to the motherboard and it lifts right out revealing the entire motherboard underneath.
- The red arrows mark the cartridge slots
- The yellow highlight is the CPU
- The blue arrows mark where the expansion modules connected
- The green highlight marks the primary RAM memory bank
The floppy controller matches the floppy drive itself in terms of huge size. All of this fits onto a small chip these days.
This is interesting - for some reason IBM used an external wire soldered between contact points. There are actually two here.