AS/400s in the Champaign area

From: Sridhar the POWERful <vance_at_ikickass.org>
Date: Sat Apr 20 11:57:19 2002

On Sat, 20 Apr 2002, Dave McGuire wrote:

> > > Regardless of what industry buzzwords the marketroids are trying to
> > > take advantage of...those machines implement the S/390 architecture,
> > > which is a mainframe architecture descended from mainframe
> > > architectures.
> >
> > Actually, those machines don't implement ESA/390. They implement z/Arch.
> > But z/Arch definitely evolved from ESA/390 R4.
>
> My mistake...it was my impression that z/Architecture is very similar
> to that of ESA/390, more so than the other evolutionary steps in the
> S/360->S/390 family architectures.

64-bit addressing, twice as many instruction formats. That's a pretty big
change. The change from ESA/370 to ESA/390 wasn't that drastic.

Peace... Sridhar
Received on Sat Apr 20 2002 - 11:57:19 BST