This is a friend's iMac G4 800, 17in, OS 10.2.x. I added an extra 512mb to the user accesible slot which
should bring the total to 768. But now the total is 512. Here's what System Profiler says:
Memory Overview:
Location Type Size
DIMM0/J22 SDRAM 512 MB
DIMM1/J20 SDRAM empty