You might want to download the latest MDSplus for MacOSX from http://mdsplus.org/, but as of December, 2009, the following was necessary (for Intel Macs, at least):
jScope.directory= ~/jscp jScope.default_server = 1 jScope.data_server_1.name = NSTX jScope.data_server_1.argument = skylark.pppl.gov:8501 jScope.data_server_1.class = MdsDataProvider jScope.cache_directory=~/ jScope.cache_size=1024
The above assumes you will keep most of your files in a subdirectory called jscp. Create this by typing at the command line:
mkdir ~/jscp