Re: Expand memory in a 170

[Larry Bolhuis <lbolhuis@xxxxxxxxxx>]

Not having tried that exact combination I suspect that you will indeed 
get 2GB of memory in the machine and it will work. I strongly suspect 
that you will get an A9001760 on the front panel before 15 minutes is 
up.  This code means 'reclaim main storage is required' which requires 
an IPL.  However Frankie runs with this code all day every day and other 
than the additional 0.005w to drive the yellow light it seems to have no 
effect at all.  I suspect the code is due to the system allocating some 
space internally to manage what's in memory (and sizes that table by 
model/feature) and the additional memory exceeds that internal table 
size for the 170.

*WARNING*  IF these boxes are production, DO NOT DO THIS.  IBM can very 
easily, and correctly, point at that for any problems leaving you in the 
lurch. You are in UNSUPPORTED territory with this upgrade.

 - Larry

Chris Bipes wrote:

> Lary,
>
> Can I cram a 170 2291 full of 3004 (256M) DIMM's?  I was told you could not
> do more that 2x 3004, 2x 3002, 2x 3001 for a total of 832M.  There are 8
> slots and IF I can put in 8x 3004 I would have 2GB of Ram.  Will it work?  I
> don't have the RAM to try and do not want to purchase if it will not work.
> This could give me another year on these boxes.
>
> Chris Bipes
> Information Services Director
> CrossCheck, Inc.
>
>
> -----Original Message-----
> From: Larry Bolhuis [mailto:lbolhuis@xxxxxxxxxx] 
> Sent: Wednesday, May 25, 2005 7:59 AM
> To: Midrange Systems Technical Discussion
> Subject: Re: Expand memory in a 170
>
>
> The older generation of 170's, of which yours is one, will NOT support 
> the 256MB DIMMs. Yes I have tried this and while no damage was caused or 
> magic smoke lost, the system simply ignores those slots. You can cram 
> the thing full of 128MB DIMMs for a total of 1GB storage. While this is 
> above the posted 832MB max for the system it will work fine. You are 
> replacing the base 64MB with 256MB to get to the 1G size.
>