Re: Did my Apple iiGS Die?

[Mitchell Spector <mitch2gs@hotmail.com>]

Delfs <eeastman@gmail.com> wrote:

>> Yes. Can anyone suggest which component to replace? Ic, capacitor, resistor? I'm handy with a soldering iron 
>> but don't know which component to replace. I posted pictures of the motherboard earlier in the thread.
>
>If the signals are high, then it is most likely the 74HCT251 chip at
>EU9.

    Thought I'd add my thoughts on this issue, particularly because 
I experienced this IIgs hardware fault twice in the past.

    Back in the early 80's I had a 16-pin joystick (connects directly
to the motherboard) with which I used on my Apple II Plus. It had
a metal casing that attracted electric static discharge, and anytime I 
got a static shock, guaranteed, it blew one of the 74LSxxx chip 
parts near the Game I/O socket. The result is it would always cause 
button-1 input (the equivalent of Solid-Apple) to go dead.

    For some careless reason, I decided to use the same joystick
on my Apple IIGS some years later (plugged into the Game I/O
socket). After I got a static shock, it caused button-1 (Option key) 
to enter a constant active state. Result was my IIgs would boot up
into the self-test and I was unable to exit. Luckily the two times
it happened, Apple replaced my motherboard under Apple Care.

    My best guess is either the ADB micro-controller chip is at 
fault, or much like my Apple II Plus, one of the 74xxxx IC's on
the IIgs motherboard.

Mitchell Spector