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Backplane contains information about the RedPower mod.
Fast CPU backplane connection. Connects directly behind the CPU block and provides expansion for the CPU local bus. You can connect up to 7 backplane blocks in row behind the CPU, and each one represents the next 8K bank of the 64k address space. Add your 8K RAM Module by right-clicking on the closest empty backplane block to the CPU with an 8K bank.