Re: Er, does "correctable frying" of Apple IIs exist?

[processoroverclocked@33mhz.cjb.net (Jon Bettencourt)]

In article <01bffb77$4362ed60$a85e78c7@colossus>, "Neil Thayer"
<sark314@hotmail.com> wrote:

> Perhaps eight years ago, at what will show itself to be the dumbstoopid age
> of 11, I had my dad obtain (for free!) a mint condition '78 Apple II from a
> friend of his.  At the time, I had only a hazy idea of its historical
> significance and collector's value.  I asked him to get it mainly so I
> could play some really old Apple versions of Atari games (Burger Time,
> Centipede, etc.).  So one day I'm fooling around with the hardware inside,
> right, and I remove and reinsert the disk controller card while the unit's
> on.  (Yes, I know, the most idiotic thing possible, but I was 11.)  The
> unit hasn't worked correctly since.  Sometimes when it boots up it won't
> automatically access the floppy drive (and yes, it did before, I had the
> ROM upgrade); sometimes the keyboard characters don't correspond to the
> keys.  Is there anything obvious that might have been fried and could be
> corrected?  Not a day goes by that I don't curse myself for ruining an
> absolutely mint original Apple II (and a FREE one at that!) all those years
> ago, and I figure I owe it to myself to at least try and fix the thing. 
> Any ideas?  Any?  :-(

Try replacing the drive controller card (there are probably hundreds on
eBay right now). Try replacing the AY-9600-Pro (or whatever it is)
keyboard encoder, if it has one. Try replacing all the common logic gate
chips. Most of the parts in an Apple II are off-the-shelf parts (the
original II/II+ especially), so it should be easy to find replacements.

I remember someone saying that the most advanced chip in an Apple II was
the 6502 processor and the dynamic RAM, and the other parts were just
off-the-shelf.

-- 
Tammy and TIA ----> Jon.

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