If I'm following you correctly, your computer lacks a parallel or "printer" port. This port accepts the male printer plug and would look like this:
Most computers have this jack or port, but progress may be pushing them the way of the 5-1/4" floppy disk I suppose - in favor of USB ports instead. If this is correct so far, you have the option of installing an "expansion card" in one of the unused slots inside your computer. Most newer PCs have one or more PCI slots available for expansion card(s). Examples of these cards are network cards, sound cards and you guess it - serial and printer cards. Many of these functions are built into the motherboard nowadays, so there's not too much need for expansion slots - and those supplied seldom are used up.
You can purchase and install a printer card for short money. They look like this:
Some of these cards may be bundled with a 9 pin serial or "aux" port or other function. Serial or AUX port card were popular with external modems and non-usb mice. Both of which have been dying off for some years now. Anyway, it's your choice whether to get just a printer port like the one above or one with additional connections on it as well. They can be purchased for under $10 (more if it has extra functionality). Here's a link
to some offered for sale. You'll need to check the available slot type(s) you have in you computer - most are PCI and some offer the older ISA style. Look at the picture below to help identify the slots in your computer:
In the picture above, the three long, black slots on the left edge of the board are ISA
slots. The 4 shorter purple slots more towards the middle are PCI
slots. The light brown slot to the right of the PCI slots is the graphics port. This slot or port as it is called, is neither ISA or PCI and is dedicated for a video card. This port is usually a PCI Express
type slot, but some older PCs may have the slower AGP
type slot instead. Prior to that was a very long slot - over twice as long as PCI called VESA Local Bus
. These are almost never seen anymore. The earliest video slot was an ISA slot - like those on the left of your motherboard. You're going to be checking for an unused ISA or PCI slot in your computer after shutting it off and opening it up. If both are available, you should opt to buy PCI expansion cards instead of ISA expansion cards whenever you need to install a card - like the printer card shown earlier.
That's it. I hope this helps and good luck! Please rate my reply. Thanks.