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'''Inicron's ROM-RAM-Box''' is a external device connected to the expansion port(with pass-trough), that provides 512 KB Pseudo-ROM. It was the very first of it's kind and opened the possibility of developing software for ROMs to every user.

 Inicron produced 128 KB, 256 KB and 512 KB ROM-RAM-Boxes. Both They used S-RAM to simulate ROMs. The S-RAM is buffered by an accumulator, that is charged by the CPC. The Uncharged the contents of the Pseudo-ROMs remains remain stable for about at least one year. However, in case of few DIY kits RAMs were used which consumed more energy which shortened the time of data retention. The advantage of using S-RAM is that one can reprogram the pseudo-ROM as often as needed.