Changes
/* Components */
VGA display component use same parameters than unix '''modeline''' command
This project doesn’t use IBM ROM of NEXYS2. Be careful if playing one day with it, physical IBM ROM is plugged on bottom of physical RAM and can put death bit for some byte address. In fact my 8th byte is death; it's why I turn always my upper RAM address bit into 1. I think that I have written one time on a ghost part of ROM, and it was fatal...