Re: Weird lines down the display

[salfter@salfter.diespammersdie.dyndns.org (Scott Alfter)]

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In article <pan.2004.09.16.22.29.26.652039@ataliross.co.uk>,
Alistair J Ross  <mail@ataliross.co.uk> wrote:
>I had a quick squint at the Apple II reference manual and noted 
>that the 74166 was indeed something to look at.
>
>On prizing it out of its slot i noted that it was corroded quite
>badly on one pin only. A gentle rub later, a reseating and all was
>dandy.
>
>I didn't believe all of this 'skootching' business up untill now
>because I have 3 dead Apples on my hands at present, but this
>sure did fix this one ;)

I received a dead II+ a few years ago...when you switched it on, it did
nothing.  Once the dead power supply was replaced, it would only display
garbage when it was switched on.  I went through and reseated every chip on
the motherboard.  Once I did that, it fired right up.  (It developed
keyboard problems in short order, but I recently fixed that with a
PS/2-to-ASCII keyboard adapter based on a microcontroller used in the
Replica I for the same purpose.)

You might want to do the same, to avoid weird glitches popping up later. 
Just pull one chip at a time, blow out the socket with some canned air to
get any dust out, put it back in, and move on to the next.  It took only an
hour or two to reseat every chip on a 48K II+ motherboard.

  _/_
 / v \ Scott Alfter (remove the obvious to send mail)
(IIGS( http://alfter.us/            Top-posting!
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