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4 Players Adapter for Atari
Here are two separate instruction sets to build the adaptor:
----1----
Some games, such as Gauntlet II, allow four player to play at once. Here are the pin assignments for the cable. You need two female 9-pin plugs and one 25-pin plug (don't remember if it's male or female).
Joystick 3 Parallel Port
-----------------------------
1 6
2 7
3 8
4 9
6 11
8 25
Joystick 4 Parallel Port
-----------------------------
1 2
2 3
3 4
4 5
6 1
8 24
Parallel port pins 18-25 are all connected to ground.
----2----
I missed a chunk of this thread so I don't know if someone posted the wiring diagram. If not then
Printer port Joystick 1 Joystick 2
1 ----------> 6
2 ----------> 1
3 ----------> 2
4 ----------> 3
5 ----------> 4
6 ---------------------------------> 1
7 ---------------------------------> 2
8 ---------------------------------> 3
9 ---------------------------------> 4
11 ---------------------------------> 6
24 ----------> 8
25 ---------------------------------> 8
Looking into the joystick socket
1 2 3 4 5
6 7 8 9
Looking into the printer plug
1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25
All info courtesy of ST format jan 1991 issue.