I openend it up and confirm it is indeed PC133 Dimm Memory. The stickers on the Ram Chips state 128Meg and 256 Respectively.
As for the memory having to be in pairs, thats not the case. I was 99% sure of this, and just pulled the 128 stick out and booted it up to the desktop to make sure. The "pairs" thing really only applies to much older motherboards around the 233Mhz times.
As was mentioned above, there is one single thumbscrew to turn loose, and the cover slides right off... VERY easy access.
Ok, now my memory is fading with age... BUT in the original ad, did it not say it was a "DVD CDRW Combo Drive Speeds vary"? I could SWEAR that is what it said.... Now when I go back it simple says CDRW drive. I remember clearly thinking the DVD would be a nice addition to this PC's specs.