# File test/backup/ProDOSFile.rb, line 10
        def initialize(filename,contents,file_type,aux_type)
                raise "filename too long - #{filename}" unless filename.length<=15
                @filename=filename
                @contents=contents
                @file_type=PRODOS_FILE_TYPES[file_type]
                @file_type=sprintf('$%02X',file_type) if @file_type.nil?
                @aux_type=aux_type
        end