EDO Ram

I recently installed 128mb of EDO ram. However, only 64mb shows up. I only had 32mb prior to installing, and I did not remove the two 16mb cards. This means I should have 160mb showing. Where is the other 104mb? And how do I get it to show up in my system. The computer is an IBM PC 350, Windows98 is the OS, and I have a 2 gig HD