We designed a 12-layer Versa Module Europa (VME) 9U by 21-slot backplane, which included a fully VME-compliant bus interface for 13 slots and custom bus interface for 8 slots with VME-compliant signal impedance and terminations. The entire card cage contained 4 off-the-shelf parallel transfer disk (PTD) controllers, 1 off-the-shelf VME repeater board with adapter to 9U/400mm, 2 image compression/decompression boards, 2 image memory address controller boards, 6 image memory boards with adapters to 9U/400mm and 2 image data translation boards.

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