Thank you! That fixed the problem. I only read the Basic Setup and Installation doc for DosBox thinking that the -t parameters only applied to CDs. I see now I should have dug deeper on the DOSBox Wiki site. Your help was very much appreciated.

Although I've known about DOSBox for years, this is the first time I've ever used it. I've been trying to install X-COM from the original floppies I bought back in 1994 because I wanted a clean install. I mounted both my OLDGAMES folder (as drive C:) and my A: drive (as drive A:) in DOSBox. The …