Memory
General information
A variety of memory (RAM) types have been used.
IBM provides instructions for memory removal and installation.
For more information on RAM, have a look at the WikiPedia RAM article.
DRAM
 JEDEC 72-pin SO-DIMM 
 JEDEC 144-pin EDO SO-DIMM  | 
SDRAM | 
DDR | 
DDR2 | 
DDR3 |