I never worked at the bare metal level...but I thought one of the major reasons they reworked the I/O subsystem in XA was to simplify doing I/O. You don't' have to deal with statues of the channel and the control unit and the device; just do an SSCH and off you go.
On Sun, May 29, 2022 at 9:17 AM Seymour J Metz <[email protected]> wrote: > I realize that SIO no longer exists in zArch; in fact, it never existed in > XA or ESA. That's why I asked about S/370 LPARs. For S/370, learning on > bare metal is more viable, but I believe that for a beginner ESA or Z on > bare metal might be more traumatic than first learning on z/OS or CMS. > -- Jay Maynard ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
