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Acorn Risc PC 4 slot backplane (front)
Acorn Risc PC 4 slot backplane (back)
The Acorn Risc PC could be expanded by adding additional case slices one on top of another. In order to add podules to a 2 slice Risc PC, a 4 slot backplane is needed. I think that 6 & 8 slot backplanes were made but I am not sure if even larger ones were ever made.