Here are the specs for DB15 game port:
Code:
Pin NonMIDI MIDI IFI
1 +5v +5v +5v
2 A-1 A-1 Trigger
3 A-X A-X X
4 Gnd Gnd Gnd
5 Gnd Gnd LED/Switch
6 A-Y A-Y Y
7 A-2 A-2 Thumb
8 +5v +5v LED/Switch
9 +5v +5v LED/Switch
10 B-1 B-1 Aux1
11 B-X B-X Aux
12 Gnd Rx Gnd
13 B-Y B-Y Wheel
14 B-2 B-2 Aux2
15 +5v Tx LED/Switch
Notice that pins 5, 8, 9, & 15 are special on the OI.
I would recomend hooking it up to an OI/RC that are just sitting there and looking at the dashboard. This may give you clues as to what goes where on a Sidewinder. Also, hook up an oscilliscope (if available) to the Rx/Tx pins and see what level/baud it uses and which way they go.