Changes

PS/2 keyboard chip was patched in order to play "Macadam" (pinball) friendly : I removed key time-out, and modified right shift-key mapping so it is a different key than the left shift-key. So left shift-key is the true shift-key in FPGAmstrad. Page-up key is a reset key (it's my panic button), Insert key is the "copy key". F1 F2 F3 is mapped at top of keyboard only, because of some bad management of "numeric lock key" in some low-cost keyboard. 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...