12 Jul 15 03:04, you wrote to All:   
      
    SD> Something Andrew brought up to me: certain file transfer protocols do   
    SD> not preserve the file date, such as XModem as used in FTS-0001   
    SD> sessions.   
      
   true... it never did, TTBOMK... none of that information is sent to the   
   receiving end... the receiving end has to specify the file name, too... the   
   only thing the protocol carries is the blocks of data, 128 bytes at a time,   
   wrapped in the xmodem packet structure making 132 byte packets... the first   
   xmodem packet is numbered one (that's important!)... if the data being   
   transferred isn't a multiple of 128 bytes, the last block is padded out to 128   
   bytes... modem (the original) and xmodem (modem with quiet mode) are extremely   
   simple protocols...   
      
   modem7 was the first extension of xmodem... it added batch transfer   
   capabilities by sending the raw file name before the first data packet...   
   telink, by tom jennings(!), fixed a problem with modem7 where the raw file   
   name may be corrupted by noise on the line during transmission... telink sends   
   a zero packet first instead of a one packet... this zero packet is a standard   
   132 byte xmodem packet with 128 bytes of data... that data just happens to be   
   the file's name, size and date... that's the first time that a file's specific   
   information is sent to the remote ;)   
      
   wow... i can't believe i remembered most of that... i had to dig into my   
   sources and a couple of notes to tie it together easily... i wonder what other   
   tidbits of info are stored in the dank dark places of my mind :lol:   
      
   )\/(ark   
      
   ... Old soldiers never die...young ones do.   
   ---   
    * Origin:  (1:3634/12.73)