z13 will IPL a 24 bit O/S. z14 will not support a 24 bit DAT. ZZSA and non-virtual memory utilities should still run.
On Wed, Sep 9, 2020 at 12:35 PM Mark S Waterbury <[email protected]> wrote: > > To add to this thread ... > > I would like to know at what point during the evolution from S/370 to > S/370-XA to S/390 to zSeries, did the architecture stop supporting IPL of any > OS that runs in "BC mode" or that starts out in BC mode, before setting up > page and segment tables and control registers and then enabling DAT? > > In other words, what processor family(s) and specific models in that family, > if need be, can no longer IPL and run any of the "public domain" operating > systems from the 1970s to early 1980s? (DOS/360, OS/360, DOS/VS, OS/VS1, > OS/VS2, VM/370, TSS/370, etc.) > > Thanks in advance. > > Mark S. Waterbury > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
