[GLLUG] Additional Serial & Parallel Ports

[Chick Tower]

I wanted to use both a serial and a parallel port on my desktop PC, but 
it's new enough that it has neither.  I found several PCI cards on 
Newegg that have serial and parallel ports.  However, in my motherboard 
manual it appears there are internal plugs for cables on the motherboard 
for one of each port.

Would a PCI card interfere with the motherboard's ports?  Is there any 
reason it wouldn't work with Linux?

Are there cables that can connect to the motherboard and some external 
ports that are simply mounted on something like those metal covers for 
the PCI slots?

Does anyone know of a cheap, local source for these devices?

Thanks.
-- 

                                Chick