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Did my Apple iiGS Die?
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| Re: Did my Apple iiGS Die? [message #368288 is a reply to message #368088] |
Wed, 30 May 2018 02:12  |
sicklittlemonkey
Messages: 570
Registered: October 2012
Karma: 0
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Senior Member |
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On Wednesday, 23 May 2018 06:37:43 UTC+12, sergiov...@gmail.com wrote:
> I'v the saem problem on my IIGS. How did you solve it? Thanks
As posted by the original author:
"Oddly enough if I plug my serial to USB adaptor into the 9pin game port the system will boot!"
I've also seen this in person, and plugging in a joystick fixed the problem.. If you don't use a joystick, you can wire some resistors up and plug it into the internal game I/O socket.
In the case I saw I checked all the ADB chip pins with a logic probe and everything seemed OK except for buttons 0/1 stuck. In the hack ("Resistor Fiasco (tm)") that I put together for the owner, it turned out that it was the resistors on the paddle inputs that seemed to somehow correct the circuit.
Otherwise Mitchell's answer has the most relevant info and likely cause.
Presumably the real fix requires debugging the button 0/1/paddle circuit (which goes all over the motherboard) and finding which part of that circuit to replace. I don't think it's the ADB chip.
Cheers,
Nick.
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