🚀 go-pugleaf

In article <jcmorris.728152342@mwunix> jcmorris@mwunix.mitre.org (Joe Morris) writes:
>rm113@cus.cam.ac.uk (R. Moss-Eccardt) writes:
>
>>To be rather pedantic, it doesn't just mean 'bad RAM'.  We get TRAP 0002s
>>on PS/2 70-121s because they have a slightly older processor module.  IBM
>>have an Engineering Change available for such machines.  
>
>Can you tell us how to identify the 70-121 units which are in need of the
>EC?  I'm running an evaluation of OS/2 using a -121, although most of its
>use is under DOS (via dual boot).  I haven't run into a 0002 and would
>prefer to avoid it if possible.
>
>(I don't even know the vintage of the motherboard.  The box got a new
>(or more properly, refurbished) system board a few years ago after
>the onboard async adapter died.)
>
>Joe Morris

I can't quite lay my hand on the bit of paper I got from the Support Centre.
It was part of an IBM internal document that is a complete 'how to diagnose
TRAP errors' guide.  It lists all sorts of part numbers that can cause 
problems, not just 70s, but 55s and others.  It also refers to a program you
can run to isolate bad SIMMs.   
However, the particular EC fixes TRAPs at cold-start.  If your machine boots 
cleanly, then you don't have the problem.