Changes
/* Second schematic RAM+VGA */
So last part of RAM is used for video (it's shown on Quasar [[http://quasar.cpcscene.com/doku.php]] and other legend website...)
For making my VGA module, I take a look at unix "modeline" command that give you us all timing for VGA signals, and it run :)
After having a VGA module displaying a RED screen (yeah !), I made it scanning last part of RAM (from 0xC000 to 0xFFFF), and I solved the puzzle.
