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GCC Romex13 Box
GCC Romex13 (top)
GCC Romex13 (bottom)
GCC Romex13 with ROMs
The GCC Romex13 is a Sideways ROM expansion for the BBC Micro. it provides an additional 12 ROM sockets. The board is attached to the top cover of the BBC Microcomputer with adhesive pads and connect to the BBC Microcomputer's motherboard by ribbon cables.
Here is the GCC ROMEX13 Sideways ROM Extension Board Users Guide.
Here are two additional installation diagrams .