Changes
/* Serial Interfaces */
* [[Amstrad Serial Interface]] ([[Amstrad]])
* [[Cirkit serial interface]] ([[Cirkit]])
* Cirkit twin-port serial interface (resold by [[Microstyle]])
* [[CPC Booster|CPC Booster/CPC Booster+]] (modern multifunction expansion, including RS232)
* [[CPCI RS232 Interface]] (DIY)