1Z280-DSRMF5Z280-J88MZG q << DATESTAMPER and CRNCH23D >> This file Z280-J88.MSG (the 'J88' indicating that it has been created in January 1988, to distinguish it from countless other files of a similar name) has been crunched with CRNCH23D, the special DateStamper-supporting version of Steve Greenberg's CRUNCH.COM. I wrote it on January 1 and am crunching it and sending Z280-J88.MZG out on the modem airwaves today, 1/3/88. For those running DateStamper and downloading it to their own computer, if they uncrunch it with UNCR23D it will automatically retain the original (uncrunched) file's datestamp data from my system. 'Automatically' here means here WITHOUT depending on the crunching party (me) entering it manually in the "comment" field or somewhere in the text. For those who notice these things this is not normally possible on either an uncompressed file or one compressed with any other version of CRUNCH. I don't think this is normally appreciated and I think we should take more time to understand what an advance this is. As a hypothetical example, suppose we don't have DateStamper -- or that we do but we're not using versions 23D of CRUNCH/UNCRUNCH -- or we're sending a file uncompressed via modem. It is December 23 and I have finally finished working on an article I have been writing. I am busy through the holidays and finally on December 28 I have some time to send it up into the public domain airwaves. I crunch it and upload it to a BBS. After the new year you download it, say on Jan. 8 and uncrunch it and soon run DateStamper's SDD (assuming you're running DS) on your disk. Surprise: it says nothing about either December 23 OR December 28 but instead tells you that both the original and crunched file were 'created' Jan. 8! This is silly -- they certainly were not created Jan. 8. The uncompressed file was created (by me) on December 23; you only received it on your system Jan. 8. CRNCH23D and UNCR3D take care of this problem. When you run "UNCR23D Z280-J88.MZG" and do a directory with SDD the resultant file Z280-J88.MSG will be seen with all its original and accurate datestamp data AS I CREATED IT ON MY SYSTEM. It is quite amazing since normally a datestamp is wedded to the disk directory (CP/M 3.0 or Z80DOS) or the !!!TIME&.DAT file (non-CRNCH23D DateStamper stamps) of the original computer or disk. CRNCH23D stores in encoded form the uncrunched file's datestamp at the very top (the 'header') of the crunched file. This method of storing a datestamp -- IN THE FILE ITSELF -- is absolutely unique in the CP/M-compatible (and MS-DOS?) world. These programs CRNCH23D and UNCR23D actually are the only way we in the CP/M-compatible world have of retaining a file's datestamp through a modem transfer. The second half of the process I'm guessing at, but I imagine that when UNCR23D comes around and uncrunches it that date information from my system is un-encrypted and sent from the file to embed itself in to the !!!TIME&.DAT file on YOUR directory. Note that you will get the original creation date -- not even the date of crunching -- from my file. This is appropriate since you thereby get a valid idea of when the file was truly created. After uncrunching, SDD should tell you that Z280-J88.MSG was created Jan. 1 and modified on Jan. 3, REGARDLESS OF WHEN YOU DOWNLOADED THE LIBRARY. Note also the irony: the process of crunching is what gives us the possibility to preserve this datestamp data; an uncrunched file cannot be dealt with in this manner, and a downloaded uncrunched file will always appear on your directory to have been 'created' on the day you downloaded it! 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