* [[KDS Electronics Serial Interface|KDS Serial Interface]] ([[KDS Electronics]])
* [[SCA CPC Prolink]]
* [[Simple RS232 for Printer usage]] (DIY)
* [[Spectre Comms Serial Interface]]
* [[Schneider RS232 Interface]]
* [[CPC Booster|CPC Booster/CPC Booster+]]
* [[Simple RS232 for Printer usage]] (DIY)
* [[Virtual Net 96]] ([[Wizcat]])
* [[Teletext adaptor]] by [[Microtext Ltd.]]
* [[Dk'tronics memory expansion|Dk'tronics RAM Memory Expansions]] ([[Dk'tronics]])
* [[Dk'tronics Silicon Disc]] ([[Dk'tronics]])
* [[Dobbertin EPROM 224]] ([[Dobbertin]])
* [[Dobbertin Memory Expansion]] ([[Dobbertin]])
* [[Inicron RAM-Box]] (Inicron)
* [[HX-RX1|Cirkit HX-RX1 Rom Expansion Card]]
* [[CPC.Flash]] internal/external 4MB ROM upgrade
* [[Dobbertin EPROM 224]] ([[Dobbertin]])
* [[Dobbertin ROM Board]] ([[Dobbertin]])
* [[Fleet EPROM Programmer|Fleet EPROM Programmer]]