The 2G-4G bar "dead zone" is for catching programs when they convert to AMODE 64. It has nothing to do with programs that run AMODE 24 or AMODE 31. The point is that an existing program that is AMODE 24 or AMODE 31 might have bit 0 of a 4-byte address on and not have any problem (because that bit is ignored when addressing storage). But when it converts to AMODE 64, that bit would now be part of the effective address (which certainly is not what the program wanted). Thus the system is set up so that a reference, in AMODE 64, to that address will program check.
Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- 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
