* [[Media:Um6845r.umc.pdf|UM6845R (UMC)]] aka Type 1
* [[Media:Mc6845.motorola.pdf|MC6845 (Motorola)]] aka Type 2 [[Media:Mc6845.pdf|Other datasheet version]]
* [[Media:CPC_Plus_Asic_Schematic.GIF|AMS40489 (Amstrad)]] aka Type 3([[ASIC]])* [[AMS40226 (Amstrad)]] aka Type 4(Pre-ASIC)
==== DIY upgrade ====