*[[C4CPC]] Cartridge replacement for the Amstrad Plus range and the GX4000
*[https://overange.weebly.com/amstrad-gx4000-cpc-464-6128-plus-reflashable-flash-cartridge.html Flash+ cartridge] Amstrad CPC+ GX4000 reflashable cartridge
*The [[M4 Board]] supports CPR cartridges, among many other features
=== Printers ===