Don't know what happened to the rest. Try again- The handbook spec says system RAM is:- "2 x 200 pin DDR-SODIMM socket for expansion, support PC2100/PC2700 DDR module, up to 1 GB" I took that to mean there would be an expansion slot. Removing the cover, I found the SODIMM and adjacent was another empty, non-SODIMM slot. Can anyone make a suggestion? Or should I simply replace the 512 with a 1 GB?