> > EDIT 2: The game selection screen also looks oddly blueish... which does seem > > consistent with the other posted video! > > That just looks like the guy had the blue on the RGB knobs turned up too much, or the > G and R turned down too much. You sometimes have to adjust them for every pcb and he > didn't do it correctly for this game.
see smf's reply, it's a weird issue with monitors that adjust their base voltage according to what it is at a certain position in vblank / vblank etc.
most do this, but not all.
maybe if one day MAME emulates different types of monitors (which in itself could add another frame of lag) we might see simulation of how each different one reacts to the signal, but until then MAME just assumes 'perfect, base voltage = 0 / black' while many monitors will do something else entirely.