In my previous mail I wrote that the result of operations (compression, encryption or what ever mathematical operations) change in Erep the 00101A0E which is Cyl 101A0 Head E to DEF1ABC2.
You can use shift of bits, XOR, AND, OR or what ever operations you like. If you can give me idea, I will check if MVS accept any other Cyl and Head with the new formula of data. The 00101A0E account the new Cyl range 0-CCCCCCCH where CCCCCCC can be FFFFFFF in hex and H range can be 0-E. Another point, in the Sense there is byte 27 which is set to 0x10 and is undocumented as far as I know, this bit maybe instruct the MVS about the new format. If somebody want and can help me to find out how the previous example Cyl and Head become DEF1ABC2 I will appriciate it? I am assuming that the Erep OBR report give in the example a real value from life of the input and output value. If you do not like to continue to use this thread of IBM-MAIN for this subject, you can send me your idea to my personal email. Thanks, Shai On Mon, Feb 8, 2010 at 6:00 AM, Shmuel Metz (Seymour J.) < shmuel+ibm-m...@patriot.net <shmuel%2bibm-m...@patriot.net>> wrote: > In <65f7ba9f1002071952h16dc097bm54a27f10bd8aa...@mail.gmail.com>, on > 02/07/2010 > at 07:52 PM, shai hess <shai.h...@gmail.com> said: > > >Some people find that I am wrong about compression and encryption, OK I > >am not expert to compression or encryption but it is not make sense to > >compress 4 bytes to 4 bytes. > > It may make sense to compress 5 bytes, where some bits are known to be > zero, to 4 bytes. In particular, doesn't EAV use an alternate format > instead of CCHH, relying on the fact that no current DASD requires 16 bits > to specify the head? > > -- > Shmuel (Seymour J.) Metz, SysProg and JOAT > ISO position; see <http://patriot.net/~shmuel/resume/brief.html> > We don't care. We don't have to care, we're Congress. > (S877: The Shut up and Eat Your spam act of 2003) > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
