Glyphstone

I'd love to be able to play Ascendancy again, it was one of the highlights of my long-ago gaming past, but it doesn't seem to be working. I downloaded and installed the game, downloaded DOSBOX, and followed the excellent how-to guide for setting it up. It worked perfectly, attempting to run Ascendancy exactly how my XP computer does - including the CD check, where it aborted and told me to insert my Ascendancy CD. I'm pretty sure this means I need to follow the alternate DOSBOX setup where it reads off a CD-image, but does anyone know where to find one?