Best way:
Search a flea-market orsimilar for an old ISA-IO-card
(or even VESA-local-bus).
These should have 1 parallel, 2 serial and 1 gameport, with either the
2 serial or 1 serial and the gameport connected via ribbon-cable
to a 2nd bracket. Most cards have 1 serial in 25pin and the 2nd in 9 pin,
leading to a situation where either the bracket on the card or the 2nd
one would fit your needs (allways the one without the gameport).