In a message dated 6/26/2008 11:27:46 A.M. Central Daylight Time, [EMAIL PROTECTED] writes: >Another workaround for us is: don't use the address in the CDE entry, if it is zero or X'80000000'. I have seen another case of a control block's containing a full word of X'80000000' that was supposed to be an address. I saw an IOSB one day that had one of its five exit addresses set to X'80000000'. IBM code didn't build that IOSB. Vendor code did. The high-order bit is interpreted for setting the addressing mode by the component that calls the exit routine, and if the exit address is zero then a default IBM exit is used instead. That I/O request worked correctly, implying that IBM's IOS code tested only the right-most 31 bits for zero. Perhaps all our user code should be written similarly; i.e., if we inspect a field that is supposed to contain "either an address or zero", then we should assume the worst case for the contents of that field, namely that the high-order bit is unpredictable as it is not strictly part of any address stored in that field. Bill Fairchild Rocket Software
**************Gas prices getting you down? Search AOL Autos for fuel-efficient used cars. (http://autos.aol.com/used?ncid=aolaut00050000000007) ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
