dtv2sertrans - a client tool for the dtv2ser device
  written by Christian Vogelgsang/lallafa <chris@vogelgsang.org>
  under the GNU Public License V2
  Homepage: http://www.lallafa.de/blog

  based on dtvtrans written by Daniel Kahlin/TLR
  
 Usage: [<options>] <command> [<arg1> ...] [+ <command2> [<argX> ...]]
 
 Commands:
   
   read     [[r]<start>,<length>] <file>.prg
            [[r]<start>-<end>]    <file>.prg
                                    read memory from DTV 
                                    prepend r for ROM, default: RAM
                                    use range, otherwise load addr of file
                                    
   write    [<start>] <file>.prg
                                    write memory to DTV
                                    use start addr, otherwise load addr of file
   
   verify   [[r]<start>,<length>] <file.prg>
            [[r]<start>-<end>]    <file>.prg
                                    compare memory from DTV with file
                                    prepend r for ROM, default: RAM
                                    use range, otherwise load addr of file
                                    
   go       <addr>                  jump to memory location on DTV
   
   reset                            reset DTV and enter dtvmon/dtvtrans
   
   param    <param_command> [<param_args> ...]
   
            dump                     print all parameters of dtv2ser
            reset                    reset all parameters to default values
            load                     load parameter set from EEPROM
            save                     save parameter set to EEPROM
            set_byte <num> <byte>    set byte parameter to value
            set_word <num> <word>    set word parameter to value
            
   diagnose <cmd> [<cmd_args> ...]
   
            read_only_client  <size> [<pattern>] 
                                     receive diagnose data from dtv2ser
            write_only_client <size> [<pattern>]
                                     send diagnose data to dtv2ser
            
            read_only_dtv     <range>
                                     receive memory from DTV to dtv2ser only
            write_only_dtv    <range> [<pattern>]
                                     write diagnose data from dtv2ser to DTV
            verify_only_dtv   <range> [<pattern>]
                                     receive memory from DTV to dtv2ser only
                                     and verify if pattern is valid
            
            transfer_result          return last transfer status
            raw_cmd <cmd>            send a raw command to the dtv2ser device
            testsuite                run some tests

   sleep <seconds>                   wait a bit (useful for command sequences)
            
 Options:
 
   -h           this help
   
   -p <port>    specify the serial port     or use DTV2SER_PORT env variable
   -s <speed>   specify the serial speed    or use DTV2SER_SPEED env variable
   -t <timeout> specify the serial timeout  or use DTV2SER_TIMEOUT env variable

   -r           read/write raw files. 
                default: PRG files with 2 byte load address