15.029 Can I use an Apple III joystick on my Apple II?
Description
This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
15.029 Can I use an Apple III joystick on my Apple II?
No. The Apple III joystick port has very little in common with the Apple
II one. The Apple III joystick's internal circuit arrangement and plug pinout
are very different from that for an Apple II joystick.
Do not attempt to connect an Apple II joystick to an Apple III, or vice
versa. At the very least, it will not work. At worst, you could damage the
computer. Here are the joystick port pinouts, for comparison:
II III
1 SW1 GND
2 +5V +5V
3 GND GND
4 PDL2 Joy-X
5 PDL0 SW0
6 SW2 +12V
7 SW0 GND
8 PDL1 Joy-Y
9 PLD3 SW1
By: David Empson
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