<div dir="ltr"><div><div>The z/OS software can run in 24, 31 or 64 bit mode.<br><br></div>You can have programs running in different modes simultaneously in their own address space (similar to a virtual machine).<br><br></div>And the programs can switch between modes.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, May 27, 2016 at 11:32 AM, R P Herrold <span dir="ltr"><<a href="mailto:herrold@owlriver.com" target="_blank">herrold@owlriver.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Thu, 26 May 2016, <a href="mailto:jep200404@columbus.rr.com">jep200404@columbus.rr.com</a> wrote:<br>
<br>
> Power<br>
> Z<br>
> P series Z series<br>
> Z 128-bit?<br>
<br>
s390 (IBM mainframe) hardware is presently 64 bit only; there<br>
was formerly a 31 (!! yes) bit hardware variant as well, but<br>
such hardware is long out of support and no longer relevant<br>
<br>
I am aware of no 128 bit variant externally released by IBM<br>
<br>
Power (and ARM, and before that MIPS and Alpha) can be either<br>
big or litle endian, although one does not find both in wide<br>
circulation<br>
<br>
-- Russ herrold<br>
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