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Atari Joysticks on Apple II using "Atari Joyport"



I want to add Atari Joysticks to my IIGS. I want to do it using the
method that uses push button and annunciator signal lines ie "Atari
Joyport" option on some Apple II games. Sirius Joyport does it this
way. I don't want to use the method that emulates the potentiometer
signals ie the way the Wico adapters work. Does anyone have the
schematics for the Sirius Joyport or description of how it uses the
annunciator lines to effectively read the five digital joystick
signals?

Best info I can find is in www.atarimagazines.com/cva/v1n1/joysticks.php.
It gives a description but I am after more detail.

Thanks.


Alex.