Changes

* [[AMS40226 (Amstrad)]] aka Type 4

*[[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 ==

* [[Media:Mos 6545-1 crtc.pdf|CRTC 6545]] (MOS, Rockwell, Synertek) is pin-compatible with the 6845 and only has minor differences

* [https://github.com/hoglet67/BeebFpga/blob/dev/src/common/mc6845.vhd BeebFpga] [https://github.com/MiSTer-devel/Amstrad_MiSTer/blob/master/rtl/UM6845R.v MiSTer] [https://opencores.org/websvn/filedetails?repname=System09&path=%2FSystem09%2Ftrunk%2Frtl%2FVHDL%2Fcrtc6845.vhd OpenCores] Verilog/VHDL implementations of the 6845

== Tools about CRTC ==

* [[File:Shaker26.dsk]] Shaker - Suite of CRTC tests associated with the CPC CRTC compendium (many of them will not work correctly on emulators and that was the purpose of the tests, to help create more compatible emulation)

* [[File:Shaker addon.dsk]] Shaker Add-On (Pixel 1 Hard Scroll / Vertical Rupture all Crtc)

== Links ==

* [https://thecheshirec.at/tag/crtc6845/ Leçons CRTC (CheshireCat)]

* [[Media:ACCC1.8-EN.pdf]] [[Media:ACCC1.8-FR.pdf]] CPC CRTC Compendium - Latest (04/2024!) document containing in-depth info about CRTC programming on CPC.

==Related pages==