CPC4MB
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Description
4 MB internal memory expansion for CPC. It's compatible with external memory expansions(Dk'tronics, Inicron RAM-BOX), using port #7Fxx. Additional 3,5MB can be used trough ports #78xx to #7Exx(see CPC4MB Page, for futher details).
Software
Currently, CPC4MB is supported by FutureOS version .8.
Schematics
Altrough CPC4MB can be ordered fully asembled(even with mounting on a CPC board), there's still a download of PCB design on CPC4MB page, if you want to DIY.