Gender Bender
To quote Mac the Knife...
You should be able to find a little dongle adaptor that converts 9-pin to 25 pin D-subs.
Care should be excercised when using a gender bender with some motherboards. If the 25 pin connector is soldered directly to the m/b then use of a gender bender plus the normal cable can put too much strain on the m/b connection. If the solder reflow system used in manufacture was not perfect then the chance of a dry joint - and intermittent working - increases. The number of new m/bs returned for reworking is enormous.
Best use a 25 to 9 cable. This is the cheapest good option
Better still...roll your own.