Longshot has released a new version of Amazing Demo and the Amstrad CPC CRTC Compendium which is a documentation about the CRTC 6845 (and some others circuits). Note that the CRTC is a generic component used in several computers including the IBM PC.
He made this demo compatible with all CRTC. The choice of Amazing Demo isnt harmless. A benchmark program : SHAKER (V1.8) comes with the compendium and shows several things stated in the document. Dont hesitate if you have a idea to add something in this document. A english version is being translated at the moment.
NoRecess wrote about this (in english)