The ROMBox is an alternative to installing a ROM expansion board inside your BBC B or Master. There is a ribbon cable terminating in a connector with a set of pins to plug into a ROM slot, although I have tested it by plugging it into a Master ROM cartridge.
There are eight ROM sockets inside the box. The bottom-right hand socket is in fact a ZIF socket. Each socket has a corresponding LED which illuminates when that particular ROM is selected. The selection is made using the dial. The ROM sockets have a protective clear casing.
This ROMBox is very handy if you use a lot of different ROMs but you don't want to use up all your sockets at once. Keep all your most popular ROMs in the box and then switch between them as and when needed.
Please click on the picture links above to learn more.