The Acer S1383 supports a maximum resolution of 1920 x 1200 (WUXGA). That's 20% more resolution than a 1600 x 1200 (UXGA) multimedia projector, which is the most common resolution supported by data projectors that were released around the same time as the S1383. This multimedia projector also supports a graphics resolution of 1280 x 800 (WXGA).
This multimedia projector's resolution (1920 x 1200 (WUXGA)) is in fact the best supported resolution across all projectors of this age and spec.
Across comparable types of multimedia projector the worst supported resolution is 640 x 480 (VGA).