Booting an IBM MP 3000 S/390 System

Paul Koning paulkoning at
Thu Aug 6 08:52:38 CDT 2015

> On Aug 6, 2015, at 9:47 AM, William Donzelli <wdonzelli at> wrote:
>> To report higher sales of OS2/Warp? ;)
>> Not the only one though, ISTR the 11/780 used a 11/03 to boot?
> Quite a lots of larger machines do.

A lot of machines have I/O processors of some sort, and often those boot first.  You can go back to the CDC 6600 and the Electrologica EL-X8 in the early 1960s, perhaps further.  Cray, ILLIAC IV, KL-10, ... lots of other examples.


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