* [[AcidInside|AcidInside - Internal ACID Socket]] (Bryce)
* [[ACU_Romboard_(DIY)|ACU Romboard]] (ACU)
* [[RomboRedux|Rombo Redux]] Remake of the Rombo Rombox (The Equalizor)
* [[CPC4MB|CPC4MB - 4 MB memory expansion]] ([[Yarek]])
* [[DIY_Cartridge|DIY Plus Cartridge]] (Bryce)