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The red arrows mark where the floppy controller, RAM expansion, and power controller were connected to the motherboard. The IR sensor is still installed, but will be removed before long.
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.