IBM RT Series Hardware Reference Manual page 388

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Switch Bank 1
1st512KB
Memory
Expansion
Adapter
2nd 512KB
Memory
Expansion
Adapter
3rd 512KB
Memory
Expansion
Adapter
4th 512KB
Memory
Expansion
Adapter
5th 512KB
Memory
Expansion
Adapter
Switch Bank 0 Switch Bank 1
2 S12KB Memory Expansion Option