The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main as well.
Steve Samson <[email protected]> writes: > The "bar" is a thick one, from 2g to 4g, "sacrificed" to avoid a > somewhat unlikely compatibility exposure. Undisciplined use of the > high-order bit in 31-bit addresses could have led to unexpected > results. The thick bar avoids such a problem. Considering the vast > magnitude of 64-bit virtual addresses, why should anyone care or do > anything to circumvent the omitted address range? one of the difference between virtual memory support on 360/67 (both 24bit & *32*bit virtual address modes) and later 370xa (on 3081). -- 40+yrs virtualization experience (since Jan68), online at home since Mar1970 ---------------------------------------------------------------------- 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
