Dear Joe
I don't have experience with using the GMU ISM software but a DOS program on Mac
This is the step
The user interface of DOSBox running on Max OS
Before you run a DOS program, you’ll have to mount its directory.
DOSBox’s environment is separate from your computer’s file system.
Here’s an example mount command:
This command mounts the Desktop directory on my Mac computer as the D: drive in DOSBox.
You can type “DIR” to list files in ism_docs directory
DOSBox can also run DOS programs that aren’t games including the Windows 3.1 operating system itself but games are its main use case
I don't know how to test ISM programs and this is my simple test.
Best regards