Why does TRAFED use a TNO file instead of a TRF file?
The TNO file is arranged so that all the similar data is stored together and written in XML format. The data can be in a variety of different formats and is not restricted by the 80-column punch card format of the TRF file. Because the XML format requires individual pieces of data to be tagged, the data can be added, subtracted, changed, or moved without causing problems between versions. The TNO file also contains additional data that the simulation does not use, like the name of the bitmap background file.