What they were trying to tell you is that nearly all new printers connect via a USB port. Your old C84 had a parallel connector and these have just about vanished from modern printers because the USB interface is much faster and the connectors are smaller.
If your PC does not have a USB port (it may have, you need to check) than you need to buy a PCI/USB adapter card and fit it into your PC. This will provide you with USB ports, like this one:
You can then use any printer that you care to buy.
Hope this helps.