CPU upgrades, pt. II - test-drb@ccmp.vtda.org

17 Apr 2000

...
   There is only
one SIMM socket.  What is the limit for ram (max)?
Where can I get something bigger than 1mb? 
Interesting, my Model 50 has a pair of SIMM sockets on the planar. They look
...
 more like 30-pin SIMMs than 72-pin ones, but I
haven't taken them out to
check yet. Also, I've never seen SIMMs like these before - the PCB is a
brown/beige colour, and the RAM chips are in small silver "cans" rather
than
...
 the usual black epoxy. 

Ok, there are two merged messages there to start with.

Also there are two versions of the PS/2M50  one is like yours and uses two
simms.  the other is like mine a 50Z that uses one.  the 50z is also 286
powered but was designed for no memory wait states.  It's a tiny bit faster.
At onepoint I had working examples of both, I kept the 50Z and geve the
other away.

...
 Anyway, I suspect you'll find that the limit for
RAM (on the
motherboard/planar/whateveryouwanttocallit) will be 2Mb. IBM used to make
these wierd, double sided, 2Mb 72-pin SIMMs specifically for some models in
the PS/2 family. 

Thats what some one else already said.

...
 I remember these SIMMs distinctly since around 10 years
ago they used to
sell for practically nothing on FidoNet as they were of no use whatsoever in
...
 anything but a PS/2. 

Figures.

Allison