ps2 memory - with weird square silver IBM Circuit packaged memory on the sti

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The  talk of  PS2 memory brought something back  to me I  have in a drawer 
here...
 
ps2 memory -  with weird square silver IBM  Circuit  packaged memory on   
the stick.
 
What is the  story on this? was IBM making it's own memory chips or  just 
repackaging them into
their  silver square packaging?
 
Now  I will have to   dig these things  out. 
 
Thank  Ed#   _www.smecc.org_ (http://www.smecc.org)