IBM PS/2 memory

Gary Sparkes mokuba at
Wed Nov 11 22:03:42 CST 2015

My model 70 (386 version) wants 85ns 2MB modules. My blue lightning 70
(486) won't accept those. It demands 2MB 80ns modules.
On Nov 11, 2015 8:36 PM, "Jules Richardson" <jules.richardson99 at>

> Just dug my IBM 65sx out, which had already lost 2 of its original 6MB due
> to a bad memory module - but it seems like the remaining 4MB is not very
> happy, either, and it flakes out at 3.7MB or so.
> Obviously I need to source some replacement RAM. Does anyone know if the
> systems are picky about what they'll work with? I believe they have to have
> parity (unless there's some magic jumper/setting somewhere to make it work
> with non-parity stuff), but are there any other gotchas involved in terms
> of DRAM type, capacities etc.?
> (I'm wondering about trying some of the RAM from my SGI Indigo2, but I
> think that would mean losing 128MB from the system to give up a 32MB module
> for the IBM, as I believe the SGI needs them to be installed in groups of 4
> - that's assuming that it's even compatible, anyway)
> cheers
> Jules

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