Apple II+ Game I/O port

[nblsavage]

I bought an Atari joystick to Apple II+ Game I/O port adapter but no game I loaded would work correctly - random movement, firing constantly, etc. I assumed it was the adapter so I bought an old Apple II joystick off of Ebay and hooked it up but have the same issues. Is there something obvious I'm missing here?

 

[ahm]

IIRC, the joystick port on the Apple ][+ is just an IC socket.
Is there a chance you might be plugging the joystick in the wrong way?
(ie. rotated 180 degrees).

Andy

 

[nblsavage]

IIRC, the joystick port on the Apple ][+ is just an IC socket.
Is there a chance you might be plugging the joystick in the wrong way?
(ie. rotated 180 degrees).

Andy

I did check that and the pins on both the port and the joystick are clearly labled, so I know it's plugged in correctly.

 

[ahm]

I did check that and the pins on both the port and the joystick are clearly labled, so I know it's plugged in correctly.

Okay, I had to ask.
So if you plug 2 different devices into the port and they both act the same way,
logically, there's something wrong with the port, perhaps a blown chip.

We'll need an Apple ][+ schematic to figure out which chips are involved with
the game port and then replace them, one by one.

Anybody have an Apple ][+ schematic?

 

[wmmullaney]

That's copyrighted by Apple, going to be rather hard to find.

 

[ahm]

That's copyrighted by Apple, going to be rather hard to find.

You're funny.

 

[magnusfalkirk]

Apple II+ schematic

Apple II+ schematic

Okay, I had to ask.
So if you plug 2 different devices into the port and they both act the same way,
logically, there's something wrong with the port, perhaps a blown chip.

We'll need an Apple ][+ schematic to figure out which chips are involved with
the game port and then replace them, one by one.

Anybody have an Apple ][+ schematic?

Here's a link to a copy of the Apple II Refernce Manual online. the schematic of the motherboard starts on page 110. You can also find pdf copies of this book that you can download. here's the link to the online version:

http://www.scribd.com/doc/200911/Apple-II-Reference-Manual-1979AppleII-IIA2L0001A

and here's a link to a webiste were you can download the pdf version of this book:

http://www.1000bit.net/support/manuali/manuali.asp

just scroll down the page a ways and you'll see it listed under Apple II.

Dean
Apple II Forever!

 

[ahm]

Thanks Dean.
Sadly, that PDF isn't of a high enough resolution to be able to read the schematic.

However, this one looks much better:
http://www.bitsavers.org/pdf/apple/apple_II/Apple][RefJan78.pdf
Info about the game i/o port is on page 150.

Should be enough info there to get started.

Andy