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ref:ymodem [2011/07/13 21:53] – digitalmanref:ymodem [2011/07/13 22:02] (current) – digitalman
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 To maintain upwards compatibility, all unused bytes in block 0 must be set to null. To maintain upwards compatibility, all unused bytes in block 0 must be set to null.
  
-==== Pathname ====+=== Pathname ===
 The pathname (conventionally, the file name) is sent as a null The pathname (conventionally, the file name) is sent as a null
 terminated ASCII string.  This is the filename format used by the terminated ASCII string.  This is the filename format used by the
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 (A:, B:, etc.) is not sent. (A:, B:, etc.) is not sent.
  
-=== Filename Considerations ===+== Filename Considerations ==
  
   * File names are forced to lower case unless the sending system supports upper/lower case file names.  This is a convenience for       users of systems (such as Unix) which store filenames in upper and lower case.   * File names are forced to lower case unless the sending system supports upper/lower case file names.  This is a convenience for       users of systems (such as Unix) which store filenames in upper and lower case.
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   *  If directories are included, they are delimited by /; i.e., "subdir/foo" is acceptable, "subdir\foo" is not.   *  If directories are included, they are delimited by /; i.e., "subdir/foo" is acceptable, "subdir\foo" is not.
  
-==== Length ====+=== Length ===
 The file length and each of the succeeding fields are optional.((Fields may not be skipped.)) The file length and each of the succeeding fields are optional.((Fields may not be skipped.))
 The length field is stored in the block as a decimal string counting The length field is stored in the block as a decimal string counting
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 any padding added by the sender to fill up the last block. any padding added by the sender to fill up the last block.
  
-==== Modification Date ====+=== Modification Date ===
 The mod date is optional, and the filename and length The mod date is optional, and the filename and length
 may be sent without requiring the mod date to be sent. may be sent without requiring the mod date to be sent.
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-==== Mode ====+=== Mode ===
 If the file mode is sent, a single space separates the file mode If the file mode is sent, a single space separates the file mode
 from the modification date.  The file mode is stored as an octal from the modification date.  The file mode is stored as an octal
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-==== Serial Number ====+=== Serial Number ===
 If the serial number is sent, a single space separates the If the serial number is sent, a single space separates the
 serial number from the file mode.  The serial number of the serial number from the file mode.  The serial number of the
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-==== Other Fields ====+=== Other Fields ===
 YMODEM was designed to allow additional header fields to be YMODEM was designed to allow additional header fields to be
 added as above without creating compatibility problems with older added as above without creating compatibility problems with older
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-==== REVISIONS ====+===== Revisions =====
  
-  * 10-27-87 Optional fields added for number of files remaining to be sent and total number of bytes remaining to be sent. +=== 10-27-87 === 
-  * 10-18-87 Flow control discussion added to 1024 byte block descritpion, minor revisions for clarity per user comments. +Optional fields added for number of files remaining to be sent and total number of bytes remaining to be sent. 
-  * 8-03-87 Revised for clarity. +=== 10-18-87 === 
-  * 5-31-1987 emphasizes minimum requirements for YMODEM, and updates information on accessing files. +Flow control discussion added to 1024 byte block descritpion, minor revisions for clarity per user comments. 
-  * 9-11-1986 clarifies nomenclature and some minor points. +=== 8-03-87 === 
-  * The April 15 1986 edition clarifies some points concerning CRC +Revised for clarity. 
-    calculations and spaces in the header.+=== 5-31-1987 === 
 +emphasizes minimum requirements for YMODEM, and updates information on accessing files. 
 +=== 9-11-1986 === 
 +clarifies nomenclature and some minor points. 
 +=== 4-15-1986 === 
 +clarifies some points concerning CRC calculations and spaces in the header.
  
  

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