User`s guide

As shown below, a PC stick button Output is normally an unconnected wire.
Most likely, inside the computer, a PC or compatible Game Port has this line
tied to a 1k-3k resistor going to +5V. So, the line will normally be at
something close to +5V (= logic 1). Pressing the button grounds the line and
pulls it down near to 0V (= logic 0).
_____Button output to PC (Press => "0")
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X Button Switch
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GND
Apple2-to-PC Joystick Conversion: Step-by-Step
DOING THE CONVERSION
To convert an Apple2 joystick for PC use you will need a cable from an old PC
stick (or a 6-wire cable and 15-pin male connector). You can find junk PC sticks
with good cables at flea markets and lots of other places. You will also need
two 330k resistors.
1. First, open the Apple joystick case and mark each wire going to the cable.
The best way is to use small self-stick labels. Label each wire by function
(e.g. "+5", "X", "GND", etc.).
You can use an Ohm meter to, for example, verify that the wire you think is
Button 0 really goes to pin 7 on the Apple 9-pin connector (or pin 2 on the old
16-pin IC style connector). Pinouts for both kinds of A2 sticks are shown below:
Apple II Joystick
(9-pin male)
[2]---- +5V
[7]---- Button 0
[5]---- X-axis
[8]---- Y-axis
[1]---- Button 1
[3]---- Ground
Apple II Joystick
(16-pin IC-style plug)
[1]---- +5V
[2]---- Button 0
[6]---- X-axis
[10]--- Y-axis