Ok.... I checked out a few more things and here's what I've come up with.
CPU-Z is a great little program!
#1) Yes, the Ram was being shared with the Video (via the BIOS). I changed it down to 8MB shared and the Ram went up to 248MB. :up: That was cool.
#2) I had a couple of extra sticks of 128MB here and I tried every conceivable configuration between them and the (2) 256MB sticks. Best I could come up with was 376MB total Ram.
No matter what configuration I tried, I could NOT get the (2) 256MB sticks to play nice together and obtain the rated 512MB.