You don't need a second copy of DOSBox for that.
Make a duplicate of your normal DOSBox shortcut, then move the [autoexec] portion of your config file to a new config file (it doesn't have to contain anything else).
Now, edit one of the shortcuts and in the "target element" field, add -conf "" at the end, after the normal config file.
Now that shortcut will run your automatic mounting, and the other will not.
__________________
"God. Can't you people see I'm trying to commit a crime against science and nature here?"
-- Reed Richards
|