On Sun, Jul 12, 2009 at 5:09 AM, Ivan Warren <i...@vmfacility.fr> wrote:
> Chip Davis wrote: > >> >> ... when shared segments were implemented in VM. >> >> It seems to me that it predated the VM/370 SEPP/BSEPP days when I started, >> but there's been many a synapse lost since then. >> >> VM/370 R6 does have DCSS (DisContiguous Shared Segments IIRC) - Even > without SEPP or BSEPP. > > But of course, contrary to modern VM systems (ie, VM/XA onward), these > needed to be defined when the nucleus is built (via DMKSNT) - and space had > to be allocated (that is, even though the space was allocated as "PERM", you > had to make sure no user MDISKs were sitting there) and formatted (through > IPL FMT) especially for this purpose on a CP owned DASD. > > Note that VM/370 R6 is still being actively used as a learning tool by some > individuals who aren't lucky enough to have access to a modern and up to > date VM system - since it is the last VM release that was available as a > no-charge SCP - and is also believed to be de-jure (although IANAL) public > domain because of the lack of copyright statement and because it was release > prior to the 1976 copyright laws. > DCSS = DisContiguous *SAVED* Segment. They aren't necessarily shared.
