Re: Apple IIgs 16 pin game I/O port question

[Mitchell Spector <mitch2gs@hotmail.com>]

mswaine <mswaine681@aol.com> wrote:

>Guys,
>
>Anybody know if the pinout for the 16 pin game I/O port is the same on
>the IIe and the GS?

    The Game I/O ports are almost identical, but not quite. Specifically 
Pin 5 and 9 differ on the IIgs. Also keep in mind the position of the IIgs
port is reversed, so devices MUST plug in backwards (upside down) 
compared with the Apple II, II+ and IIe.

    Pin 5 on the IIe is "Strobe", Pin 5 on the IIgs is +5 volts pull up.
Pin 9 on the IIe is unused, Pin 9 on the IIgs is switch 3 (I suppose
offering the potential for a 4 button joystick, never saw one).

Mitchell Spector