* [[Data Media Disc System]] (disc drive with built-in RS232 interface) ([[Data Media]])
* [[KDS Electronics Serial Interface|KDS Serial Interface]] ([[KDS Electronics]])
* [[Panda Electronics Communications Interface Unit]] (driver ROM on NVGdual RS232 plus 8bit printer port) (Panda Electronics Ltd)
* [[RS-232 para Amstrad]] ([[MHT Ingenieros]])
* [[SCA CPC Prolink]] ([[SCA]])