> My screen has black borders on all 4 sides on moon > patrol. This normal since this is what this thread is about?
That shouldn't be happening, games should stretch to the edge of your display in at least one direction. Post the contents of your mame.ini and tell me what video card you have.
With the right settings MAME will fill as much of your screen as possible while keeping the game running at a 4:3 (or 3:4 for vertical games) aspect ratio. On horizontal-monitor games I get black bars at the top and the bottom because my monitor is 5:4. Some games fill this space with bezel artwork, which is nice. For vertically oriented games, it's even better..although Burger Time appears a bit squeezed horizontally in the attached screenshot.
Note that if you don't have artwork_crop set to 1, MAME will try to fit all of the game artwork on your monitor. If the game you've loaded up has high res bezel artwork (and you don't have an incredibly huge and high-res display) this causes the actual game area to be very small.
Burger Time on my 5:4 display with artwork_crop set to 1: