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Adding second joystick to PC joystick interface
PC joystick interface was designed to support two joysticks, but unfortunately it has only one connector. The second joystick can be added when you get a special Y-cable, which has connectors for two joysticks. Those cables can be bought ready-made from nearly any good computer store, but can be easily made if you already have the parts. If you decide to build Y-cable yourself, make it well and avoid possible short circuits (+5V line can give quite remarkable amount of current in short circuit and burn your wiring).
Some other manufacturers have made joystick interfaces which have two connectors. Some manufacturers have saved few cents in their multi-io cards and impelemented only the electronics of the joystick one.
Y-cable
|----------15-pin female f1
------------------ |
| 15-pin male m1 |-----------|
------------------ |----------15-pin female f2
m1 f1 f2
-----------------------------------------------------------
1 : +5vDC 1
2 : Stick 1 button 1 2
3 : Stick 1 X-position 3
4 : Gnd 4
5 : Gnd 5
6 : Stick 1 Y-position 6
7 : Stick 1 button 2 7
8 : +5vDC 8
9 : +5vDC 9 1
10 : Stick 2 button 1 10 2
11 : Stick 2 X-position 11 3
12 : Gnd 12 4 and 5
13 : Stick 2 Y-position 13 6
14 : Stick 2 button 2 14 7
15 : +5vDC 15 9
Y-cable problems with soundcards and how to solve them
Jystick connector typical PC sound card is not fully compatible with the original PC joystick interface, because soundcard manufacturers have replaced pins 12 and 15 with the MIDI interface pins. If the joystick or joystick adpater you connect to soundcard useds those pins, then it will not work properly with soundcard joystick interface. I think that it was quite stupid choice form Creative Labs to put the MIDI signals to the Soundblaster's joytick interface, and then all other manufacturers have copied this stupid idea. It seems that the manufacturer's customer support is typically unaware of this incompatibility and great deal of problems this causes to many users. Typical problem are that some joysticks doe not work properly and even in worst case the soundcard doughterboard stops to work when some otherwise well working joystick is connected to the joystick port.
It is possible to build an adapter wich enable using two joysticks or joystick with pedals on soundcard interface.
D15S (male)----------D15S(female)
to soundcard---------to joystick
1------------------------1
2------------------------2
3------------------------3
4------------------------4
5--------------------+---5
6--------------------|---6
7--------------------|---7
8--------------------|---8
9 ----+--------------|---9
10----|--------------|--10
11----|--------------|--11
12 | +--12
13----|-----------------13
14----|-----------------14
15 +-----------------15
When you have built this interface, you can then use any standard joystick or joystick Y-cable with it. If you heap up your soldering iron to make your own adapter, then why not make a complete workign joystick Y-cable using the following modified wiring scheme which works with the soundcards also.
Soundcard stick1 stick2
-----------------------------------------------------------
1 : +5vDC 1 1
2 : Stick 1 button 1 2
3 : Stick 1 X-position 3
4 : Gnd 4 4
5 : Gnd 5 5
6 : Stick 1 Y-position 6
7 : Stick 1 button 2 7
8 : +5vDC 8 8
9 : +5vDC 9 9
10 : Stick 2 button 1 10 2
11 : Stick 2 X-position 11 3
12 : MIDI
13 : Stick 2 Y-position 13 6
14 : Stick 2 button 2 14 7
15 : MIDI
For those who are looking for ready-made cable, go to your computer store and ask for "Joystick Y cable". Many manufacturers make this type of cable, the best known cable might be Gravis "Y" Cable.
Soundcard joystick port problem solver
Typical PC soundcards (for exampel Sound Blaster family) has added MIDI interface to the joystick connector by using pin 12 for MIDI output and pin 15 for MIDI input. This causes sometimes problems with some joysticks and adapters which work pefectly on standard joystick port. The following conversion circuit enables standard joystick Y-cables to be used with soundcards without problems. This circuit provides GND to pin 12 and +5V to pin 15 as in original PC joystick interface. This enables using standard Y cables and joyticks with extra functions (like pedals) to be used with soundcards without problems like some of the joystick functions not working properly or the MIDI doughterboard does not work when joystick is installed.
D15S (male)----------D15S(female)
to PAS-----------------to joystick
1------------------------1
2------------------------2
3------------------------3
4------------------------4
5--------------------+---5
6--------------------|---6
7--------------------|---7
8--------------------|---8
9 ----+--------------|---9
10----|--------------|--10
11----|--------------|--11
12 | +--12
13----|-----------------13
14----|-----------------14
15 +-----------------15
NOTE: Do not try to connect your soundcard MIDI adapter after this circuit ! Connecting MIDI adapter to this circuit can damage it.
