I am having a similar issue trying to get ahold of the "Starbase Hyperion" BASIC code.
The files in the directory are hidden on the BASIC boot disk. The variables were removed from the program using the standard method, but the fixes for this require me to be able to access the saved file. LISTing the file to a device does not get the job done.
If I look at the BASIC as it is executing in Altirra, the debugger also will not show the variables. Can anyone help me either list the directory or get the variables to show in the debugger, and show me how to save a working copy of the program?