I often get emails asking me how to connect / format various printers, scanners, pole displays, etc. to their computer to use with my POS software. To which I respond, "What port does your thingie plug into, parallel, serial, USB, or other.?" To which a common response is, "How am I supposed to know? Fair enough. So below I am posting some photos of various plugs and ports to compare and help the "port challenged" to determine which port they are trying to stick their thing into.

5 Pin DIN Plug
Really? Just how old is your computer?