You really have to pull one of the existing chips and bring it to the guy. Tell him this is what you want then return it if he makes a mistake at that point.

My guess, based on the age would be you are probably looking at pc100 sdram. Faster SDram is not usually a problem but DDR ram will likely not work on that system.

A good computer techie in your neighborhood can be worth his charge if s/he just makes your problems go away.

If you are dead set on buying a particular camera you might buy it first and see how well it works with your system. I've had reasonable success with windows98 machines so long as they have USB ports.

sigurd