Thanks for those helpful links, Applefreak!

I have been plugging away all night, but still can't get things working. According to the ][e card panel, my ProDOS partition is D2, S5. So I have tried typing many various versions of:

CAT, D2 ,S5

CAT, D2 ,S5, V0

CAT D2,S5

CATALOG, D2, S5

etc

Somehow I can't even access the partition, and I really don't understand why. Supposedly you can just drop files into it from the desktop, but so far as I can tell it is just a black hole. Everything I do is a syntax error even after reading all night. Looks like I still have a lot to learn here, but I wish I at least knew if my setup was working properly.

Also the ImageConverter program is causing me problems. "Simply" drop any Apple 2 disk image to have it converted? It ignores my .dsk files.

I have never had such a difficult time getting started on any computer system!