(MESS) p2000t : fixed regression that happened in the 146-147 cycle. Last line of the display was not visible.

git-svn-id: svn://dspnet.fr/mame/trunk@26434 749742ba-7341-0410-aadc-df50b521781e
(MESS) New skeleton driver added : Robot [Miodrag Milanovic]

git-svn-id: svn://dspnet.fr/mame/trunk@26435 749742ba-7341-0410-aadc-df50b521781e
Added Atari 2600, 5200, and 7800 palette notes.  [Robert Tuccitto]

git-svn-id: svn://dspnet.fr/mame/trunk@26436 749742ba-7341-0410-aadc-df50b521781e