* [[SCA CPC Prolink]] ([[SCA Products]])
* [[Schneider RS232 Interface]] ([[Schneider]])
* [[Z80 STI RS232 interface]] compatible to the one before, DIY!
* [[Schneiderware V/24 Interface]] (DIY) ([[CPC Schneider International]])
* [[Simple RS232 for Printer usage]] (DIY) (one-directional, transmit only)