Yamaha DTXpress/DTXplorer/DTXtreme

The driver is usually contained in your sequencing software. You should be able to select serial port as one of your MIDI In - Out Devices. If not, you can download Roland's Serial driver from their web site. It should interface with your sequencing software and appear in your Midi mapper under windows.
Good luck

PS - by the way, if you have a sound card, most of them have a built in MIDI interface that is part of the "game controller port". You can get a cable that allows you to attach both standard MIDI cables and a game controller to the port at the same time.

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