no, it will not do CGA or EGA like the WG D9200.
from happ's, the supported resolutions:
640 x 480 31KHz 60Hz
720 x 400 31KHz 70Hz
640 x 480 37KHz 75Hz
800 x 600 37KHz 60Hz
I have one, it it looks great in vga! but if you really really want 15KHz, then don't get this monitor.