IBM 3174 C 6.4 Microcode Disks?

Kevin Bowling kevin.bowling at
Fri Feb 15 23:03:24 CST 2019

There was quite a bit of difference up until POWER6 although each
generation came closer and closer together.  It wasn’t just the IOPs, the
systems had different management controllers, cases, expansion enclosures,
etc as late as POWER5 and only ran AIX in LPARs or PASE.

The early PowerPC 400s were PowerPC-AS chips designed in Rochester, MN
whereas most other POWER and PowerPC work was an Austin, TX creation.
Rochester did the RS64 family of processors which were very nice low power
chips that also introduced “hyperthreading” and other advanced technologies
but these were offered in RS/6000s as well for commercial workloads (DB,
web services).

On Fri, Feb 15, 2019 at 7:02 PM Paul Berger via cctalk <
cctalk at> wrote:

> On 2019-02-15 4:04 p.m., Liam Proven via cctalk wrote:
> > On Fri, 15 Feb 2019 at 19:27, Paul Berger via cctalk
> > <cctalk at> wrote:
> >
> >> Knowledge Center refers to it as IBM i, but it is not the name of a
> >> system it is just the name of another OS that runs on IBM Power systems
> >> and can even be vitalized on a system with other OSes.
> > IBM moved the AS/400 onto POWER processors. The TIMI (sp?) firmware
> > made this doable and binaries were portable from the old hardware. The
> > OS was renamed i5/OS.
> >
> > Later they replaced the proprietary POWER hardware with generic POWER
> > servers, and they renamed the OS to IBM i.
> >
> > IBM supports 3 OSes on POWER servers now: AIX, Linux and IBM i.
> >
> > Silly name, though.
> Only the very first RISC based AS/400s where really different hardware,
> by the turn of the century when the second generation of RS64 / Power3
> systems where coming along there was already a lot of common hardware
> between AS/400or iSeries and RS/6000 or pSeries  only by Power5 time the
> hardware was all the same except iSeries was still clinging to the IOP
> but even that went away with Power 6 and even the support for Twinax WSC
> is gone now  since the last ones where PCI.
> Paul.

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