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

["Michael J. Mahon" <mjmahon@aol.com>]

Mitchell Spector wrote:
> 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).

Ah, yes--I'd forgotten the loss of strobe...  ;-)

And I suspect their hope was that the machine could now support two
2-button joysticks.  ;-)

-michael

AppleCrate: An Apple II "blade server"!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
tool--and it's seriously underused."