On Fri, 10 Aug 2007 17:12:00 -0400, Neale Ferguson <[EMAIL PROTECTED]> wrote:
>No it program checks on an attempt to issue the SIGP to put the machine >in 64-bit mode. > >On Fri, 2007-08-10 at 14:08 -0700, Schuh, Richard wrote: >> Can an XC machine run 64-bit? Isn't XC a pseudo mode invented so that >> CMS could access SFS DIRC directories that were in dataspaces? >======================== ========================= ========== ============== I don't think you can run any guest in XC mode besides CMS, but I don't k now why. Maybe it has to do with turning DAT on? Nothing to do with 64-bit mode. At least, that was my problem #1 when I installed the Marist Linux distri bution back in early 2000. (The XC mode was hiding in a directory profile.) This was 31-bit Linux, s ince 64-bit didn't exist yet (at least outside of IBM). I wouldn't call it a pseudo-mode, though. It is as "real" as anything els e in microcoded hardware is. It is special in that it is designed to allow use of dataspaces (and access registers) with DAT off. It's just that the only operating system that I know of that runs DAT off is CMS. Alan(dot)Ackerman(at)Bank of America(dot)com
