I am considering purchasing a new monitor, and one of its uses will be for a minimig... I have two questions

1. What resolution does the minimig output?
1024 x 768?
800 x 640?
640 x 480?
Pal resolution depending on the game? (such as 320 x 256, 640 x 256, 640x512, etc.)
I suspect the Minimig would scale all video outputs to a fixed resolution, maybe someone knows what it is.
2. If I use a non 4:3 monitor (such as 5:4 or 16:9) will the screen be stretched to fill all screen (ewwww) or it will have borders on sides?
Thanks in advance!