Inicron RAM-Box
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A interface to expand the CPC with up to 512 kB RAM. Since the box is not 100% compatible to DK-tronics or Dobbertin-Expansions, it is not supported by Symbos or FutureOS. The box was originally designed to work as a battery-buffered RAM-disc (as supported by Dobbertin RDOS).
Technical specs.
Works more or less like the standard Dk'tronics memory expansion and Dobbertin Memory Expansion. The main difference is that it can map expansion RAM only 4000h..7FFFh.