Booting an IBM MP 3000 S/390 System

Sean Caron scaron at
Thu Aug 6 10:04:07 CDT 2015

And so it remains today; most servers sold for data center applications
include a little service processor ... I've found it's usually a little
embedded ARM or PPC ... that you can use for remote console, remote power
control, etc. Although these are not required to bootstrap the system, of

If you think the MP3000 is a slow booter, we just got some new 4U machines
in where I work; 1.5TB RAM; those things take almost 20 minutes to POST -
no joke!



On Thu, Aug 6, 2015 at 10:56 AM, Chuck Guzis <cclist at> wrote:

> On 08/06/2015 07:33 AM, Al Kossow wrote:
> Main processor microcode is in RAM. Putting microcode in ram and having
>> a small computer load it was actually pretty common in the 70's and 80's
>> in larger systems since then you didn't have to manage the hassle of
>> patching microcode in ROM.
>> Apple ended up putting a small TI microcontroller in the G5 because it
>> also couldn't boot on its own. There was a bunch of volatile state you
>> had to set up before it would fetch its first instruction.
> And really big iron almost always had some sort of maintenance control
> processor--some with their own mass storage.  Have a separate, simpler
> processor handle the management of a larger one made a lot of sense,
> particularly when it came to diagnostic activity.
> Think Cray, CDC,...
> --Chuck

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