I'm trying to use Dosbox fullscreen with 1920x1080 resolution (23 inch monitor, Radeon 4870, Win7) but no matter what settings i try i always get pillarboxes either up/down or left/right. Has anyone configured it widescreen so that the image is streched? I've read the manual and faq, but couldn't find solution there. The best results i get with these settings:

fullresolution=1920x1080
output=ddraw
aspect=false
scaler=normal2x
PROBLEM: black boxes left and right
if i change fullresolution=1280x1024 i get black boxes up and down. Setting it to original or fixed doesn't help. Is there a way to get rid of the boxes?