* [[RAM BOX]] 512Kb memory expansion
* [[RAM7 2Mb memory expansion]]
* [[Universeller EPROM Programmer 4004]] ([[Dobbertin]])
* [[Vortex Expansions RAM card]] ([[Vortex Computersysteme|Vortex]])
* [[CPC.Flash]] internal/external 4MB ROM upgrade
* [[Dobbertin EPROM 224]] ([[Dobbertin]])
* [[Dobbertin ROM Board]] ([[Dobbertin]])
* [[Fleet EPROM Programmer|Fleet EPROM Programmer]]
* [[KDS ROM Board]] ([[KDS Electronics]])
* [[Micro Power ROM Box]]
* [[X-ROM]] ROM expansion and ROM burner
* [[Universeller EPROM Programmer 4004]] ([[Dobbertin]])
* [[CPC GX4000-Multi EPROM Cartridge]] Use a GX cartidge for modified ROM software