re: http://www.garlic.com/~lynn/2006b.html#25 Multiple address spaces
somebody just reminded me that access registers didn't ship until 3090 (they weren't on 3081). i have some recollection of various architecture discussions about access registers that i remember being in the 811 candy-stripe document time-frame i.e. 3081/370-xa architecture documents that took their name from nov78. i had a drawer full and was once approached by some vendor about their possible availability. And even tho i denied even knowing what they were talking about; the fact that they even approached me turned up in some later litigation and earned me a debriefing with the FBI. 3081 had some mvs addressing constraint relief that resulted from the combination of mvs kernel (8mbyte) and the common segment (large installations having it grow to 5megs) ... with dual-address space stuff (introduced on 3033) as well as 370-xa introducing 31-bit virtual addressing (although it took some time for environments to transition from 24-bit addressing and take advantage of the additional addressing above the 16mbyte line. the person responsible for dual-address space architecture was also heavily involved in the microprocessor convergence to 801 and endicott planning on using 801 microprocessor for the 4341 followon. lots of past 801, romp, rios, power, etc posts http://www.garlic.com/~lynn/subtopic.html#801 recent post mentioning thread between (3033) dual-address space and itanium-2 http://www.garlic.com/~lynn/2006.html#39 What happens if CR's are directly changed? ---------------------------------------------------------------------- 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
