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Castle Iyonix backplane (front)
Castle Iyonix backplane (back)
Caslte produced this 2 slot backplane to allow podules from previous RISC OS computers to be used with the Iyonix. However I am not certain how many podules were ever used with an Iyonix, mainly because the driver code would have to be 32-bit clean. The backplane serial number is "IS009-000572".