I missed that it also has a Compact Flash (CF) card slot.
Searching has this AI overview
The Fujifilm Finepix S9500 supports both CompactFlash (CF) and xD Picture Cards, with a maximum capacity of up to 8 GB for CompactFlash cards. While it also has an xD card slot,xD cards have a much lower maximum capacity, typically around 2 GB. It's important to note that the camera's internal circuitry significantly limits read/write speeds, so even high-speed CF cards won't perform optimally.
So, it is worth looking for CF cards at up to max 8GB
But a word caution using CF, there are connection pins in that socket and over many years there were reports of users of cameras with that type of memory card, having an issue with bent pins.....the prime reason for this was a misalignment and too much force being used when inserting the card.
Your camera as you point out is old ........so it might be worth inspecting that socket with a torch to look at the pins to ensure they are ok!
PS as for technology improving, yes but with older tech cameras you rarely have access to newer technology e.g. such as SD cards which now have various iterations in regard to read/write speeds and that there are now UHS-I and UHS-II variants.........and even some current cameras can't use UHS-II version.
