Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!think!bloom-beacon!mit-eddie!bbn!uwmcsd1!csd4.milw.wisc.edu!neighbor
From: neighbor@csd4.milw.wisc.edu (Jeffrey Alan Ding)
Newsgroups: comp.sys.apple
Subject: Re: Help- Fried Apples & Dumplings
Message-ID: <5709@uwmcsd1.UUCP>
Date: 2 May 88 17:59:37 GMT
References: <5718@sigi.Colorado.EDU> <189@studsys.mu.edu>
Sender: daemon@uwmcsd1.UUCP
Reply-To: neighbor@csd4.milw.wisc.edu (Jeffrey Alan Ding)
Organization: University of Wisconsin-Milwaukee
Lines: 41
Keywords: ][+ //e Dead

In article <189@studsys.mu.edu> jetzer@studsys.mu.edu (jetzer) writes:
>We had a similar problem with a ][+.  It seems that just pressing down
>on any chip near the back right corner of the motherboard made it work
>properly, for about 5 minutes.  Made me think that some of the chip/socket
>connections were corroded or something.  But, ][+'s have a very low priority,
>and we had an extra (good) motherboard laying around, and swapped it.
>
Type pulling out all the chips on the motherboard and put them back in.
This will break all the corroded contacts might solve the problem.

>Also had a similar problem with a couple of //e's at various times.  Once
>someone tried to plug in a joystick, but the disk controller was in the
>way ... so he removed the card from the slot (while the power was still
>on!).  Same type of mess, although it was usually lores graphics.  Swapped
>every chip on the motherboard, and determined that one of the RAMs was bad.
>Surprised me that a bad RAM would do this, but ...
>
I don't see how a bad RAM was the trouble.  If you pull out a card while
the power is on you risk damaging the card, not the computer.  But I
don't doubt the computer got messed up.
>Another time someone in the electronics class was making an interface
>card for a robot arm.  Got two wires mixed up, and fried the //e (they
>now use ][+'s in the robotics class  :-).  What was really interesting

I would like to know which two wires.  It is pretty hard to fry the
motherboard on an Apple computer.  If you directly short out the
power supply by mistake, it will shut down and nothing will get
damaged.  Any other of the wires on the connector will only cause
the computer not to work.  Turn the power off, take the card out, and
turn the power back on and the computer should work just fine.  The
problems occur when you forget to turn off the power to take out and
insert cards.

>Mike Jetzer
>"Hack first, ask questions later."

neighbor@csd4.milw.wisc.edu

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