IBM XT 286 Operation Manual page 67

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Using the following table set the switches on
your option. Then go to the next step.
Note; The 512KB/2MB Memory
Expansion Adapter must be filled to its
capacity of 2MB (2048KB) before you
install additional memory expansion
adapters.
First
Adapter
Second
Adapter
1 2 3 4 5
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Third
Adapter
1 2 3 4 5 6 7
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Switch
Switch
Block
Memory Adapter 4-13