Re: old olympus camedia c-840l. used card reader to download photos..where have they gone?.
They've gone the way of the Model T Ford, almost.
You can probably still find Camedia to download if you still have the cable (and a USB-to-RS-232 adapter, and if Camedia still runs on current versions of Windows).
The card is a SmartMedia card. I used to use the Dazzle reader, and it seems to be still available, and pretty cheap.