On 10/05/2018 10:55 AM, Mark Regan wrote: > https://www.zdnet.com/article/ibm-mainframe-containers-grow-more-secure/ > >From the first paragraph of the above article: “In the 1960s, IBM's 650 mainframe operating system had two modes, MFT and MVT, in which process got its own address space and couldn't interface with others processes running parallel with it. This was the ancestor to both virtual machines (VM) and containers.”
This illustrates the dangers of someone whose computer education starts with the Z80 attempting to write anything relating to IBM mainframe history after inadequate research: confusing the 1964 IBM S/360 with the 1953 IBM 650; thinking there were only two [S/360] Operating Systems, MFT and MVT, when those were only slightly different variants of the same S/360 OS/360 Operating System, with other competing Operating Systems for smaller S/360 systems; thinking both of the above supported multiple virtual address spaces, when (except for S/360/67) the S/360 hardware didn't even support virtual storage, much less multiple virtual address spaces; Storage protect keys allowed for some isolation between partitions in the single address space, but the isolation was not total; thinking either of those Operating Systems had anything to do with the independent development track of VM/370 for IBM S/370. JC Ewing -- Joel C. Ewing, Bentonville, AR jcew...@acm.org ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
