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@@ -52,3 +52,41 @@ Installing:
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version installed, close all SDL2 applications before replacing the old
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copy. Also make sure that any other older versions of DLLs are removed
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from your system.
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+
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+
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+Joysticks in SDL2:
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+------------------
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+
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+The joystick code in SDL2 is a direct forward-port from the SDL-1.2 version.
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+Here is the original documentation from SDL-1.2:
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+
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+The Joystick detection only works for standard joysticks (2 buttons, 2 axes
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+and the like). Therefore, if you use a non-standard joystick, you should
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+specify its features in the SDL_OS2_JOYSTICK environment variable in a batch
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+file or CONFIG.SYS, so SDL applications can provide full capability to your
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+device. The syntax is:
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+
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+SET SDL_OS2_JOYSTICK=[JOYSTICK_NAME] [AXES] [BUTTONS] [HATS] [BALLS]
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+
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+So, it you have a Gravis GamePad with 4 axes, 2 buttons, 2 hats and 0 balls,
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+the line should be:
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+
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+SET SDL_OS2_JOYSTICK=Gravis_GamePad 4 2 2 0
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+
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+If you want to add spaces in your joystick name, just surround it with
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+quotes or double-quotes:
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+
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+SET SDL_OS2_JOYSTICK='Gravis GamePad' 4 2 2 0
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+
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+or
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+
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+SET SDL_OS2_JOYSTICK="Gravis GamePad" 4 2 2 0
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+
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+ Note however that Balls and Hats are not supported under OS/2, and the
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+value will be ignored... but it is wise to define these correctly because
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+in the future those can be supported.
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+
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+ Also the number of buttons is limited to 2 when using two joysticks,
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+4 when using one joystick with 4 axes, 6 when using a joystick with 3 axes
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+and 8 when using a joystick with 2 axes. Notice however these are limitations
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+of the Joystick Port hardware, not OS/2.
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Ozkan Sezer