Clark Martin
A designated driver on the information Super Highway

> On Feb 2, 2019, at 12:25 PM, Jeff Hubatka <jhuba...@gmail.com> wrote:
> 
> On Feb 2, 2019, at 5:07 AM, vintage-macs@googlegroups.com 
> <mailto:vintage-macs@googlegroups.com> wrote:
>> 
>> The batteries are dead but it will run off of the AC adapter. Any 
>> solution on the batteries?

Even if you don’t refurbish the batteries, keep them, they may a a good 
ballast, otherwise the laptop tends to tip over.

>>  
>> It would be easiest to start with a new functional machine, but my son 
>> wants to try to fix it, and I am ok with that.
>>  
>> What's the best OS to run on the 520? I've noted that it crashes when 
>> booted with extensions, but will boot to stable with extensions 
>> off...but then you can't do anything with the machine. It looks like it 
>> has 8.1 on it...with tons of extensions. We haven't used it for a long 
>> time; it was my wife's machine back in the day.

It should have extension manager on it.  You can use it to enable/disable 
individual extensions.  Use it to turn off half the extensions then reboot it.  
If it boots okay then the problem is in the remaining half, if not it’s in the 
group that was enabled.  Which ever case, enable half of the remaining suspect 
group and try again.  Repeat till you get it down to  the (hopefully) one 
extension causing trouble.

When you find the problematic extension it may be just a flaky extension or it 
may be one of it’s data files is corrupt and removing the data file may fix it.

> 
> 
> It’s been a long time but I remember reading about a refurbishment of the 
> 500-series batteries. It involves cutting the original apart at the seam line 
> and replacing with some Panasonic batteries, I believe it contains six cells.
> 
> If it is running 8.1 I think it has to be PowerPC, isn’t it? I have 8.0 on my 
> 100mhz upgraded model.

68040s could run up to OS 8.1.
> 

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