* [[Media:CPC_Plus_Asic_Schematic.GIF|AMS40489 (Amstrad)]] aka Type 3 ([[ASIC]])
* [[AMS40226 (Amstrad)]] aka Type 4 (Pre-ASIC)
==== DIY upgrade ====
*[[Media:CRTC-5-HD6345.pdf|HD6345 (Hitachi)]] aka Type 5 - Upgraded pin-compatible CRTC chip with advanced functionalities [https://thecheshirec.at/2024/05/07/un-crtc6345-sur-amstrad-cpc/ Upgrading the CPC to HD6345]
==== Unused clones ====
