On a slight side note: You can use standard game controllers. Here are the offical specs for DB15 game port:
Code:
Pin NonMIDI MIDI
1 +5v +5v
2 A-1 A-1
3 A-X A-X
4 Ground Ground
5 Ground Ground
6 A-Y A-Y
7 A-2 A-2
8 +5v +5v
9 +5v +5v
10 B-1 B-1
11 B-X B-X
12 Ground MIDI Rx
13 B-Y B-Y
14 B-2 B-2
15 +5v MIDI Tx
Just remember that pins 5, 8, 9, & 15 are special on the OI.
Does the Sidewinder use MIDI? Try setting it up as some other kind of controller.