Booting an IBM MP 3000 S/390 System

[Jay Jaeger]

Until that console processor fails with no backups.  I seem to recall
having 4 or 5 "backups" (aka operators).  ;)

On 8/6/2015 2:07 PM, Fred Cisin wrote:
> On Thu, 6 Aug 2015, Jay Jaeger wrote:
>> Acch.  All this modern/complicated stuff.  Once you powered on an IBM
>> 1410 (2 seconds), you could have it (141O O/S: 1410-PR-155) running in
>> as little as a minute, counting the tape drive mount:
>> Mount tape on unit 0 [30 seconds tops, as tape is probably already there]
>> Storage Scan to +1
>> Sense switches to a blank character
>> [The above two were normally left that way]
>> Mode switch to CE
>> Computer Reset
>> Start
>> 00000    [This clears storage]
>> Computer Reset
>> Move Mode Switch to Display
>> Start
>> 00000    [Display before altering]
>> Press margin release on console typewriter while it types out "bbbbb"
>> Computer Reset
>> Move Mode Switch to Alter
>> 00000
>> A(WM)L%B000012$(WM)N   [Read tape to end of core/record to loc 12]
>> Computer Reset
>> Start
>> [Wait about 10 seconds for 1410-PR-155 to load]
>> :)
> 
> Obviously it is simplest if somebody (or machine) outside, loads
> the code into memory, and then triggers a GOTO.
> Which is cheaper, or more reliable, a "trained" operator, or a
> smaller external machine?
> 
> Your expertise is the simplest and most reliable way to do it.
> But, if adequately appreciated, you are probably no longer the cheapest.
> So, they tried to replace you with a machine.
> 
> 
> 
> 
>