Robert A. Rosenberg wrote:
There was also the secondary use of the high bit to signal AM24 vs AM31 in addresses used for branching to/from subroutines. This required replacing BALR with BASR and BR with BSM to do the AM Mode Switch.
And, the low-order bit of the address now indicates switching to 64-bit mode using pointer-defined linkage. This has caused a number of software issues for code that tried to process those pointers using other instructions without first clearing bit 63.
-- Edward E Jaffe Phoenix Software International, Inc 5200 W Century Blvd, Suite 800 Los Angeles, CA 90045 310-338-0400 x318 [EMAIL PROTECTED] http://www.phoenixsoftware.com/ ---------------------------------------------------------------------- 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
