From: "Vintage Computer Festival" <vcf at
On Fri, 27 May 2005, tom ponsford wrote:
Thanks for the voltage specs but what about polarity? ;)
Well looking high and low over the adapter. I could not find ANY
markings that would show the tip polarity. it might be on the jack inlet
on the computer itself, which I don't have in front of me. For some
reason I always though the tip polarity was on the inlet itself or was
indicated by the color of the tip (or was that the size indicator?) .
Didn't see any markings on the computer itself.
It's too late and past my bedtime for me to
give cognizant answers :-)
Can you just put a voltmeter to it in the morning and let me know?
Finding the polarity is usually easy. Most setups
connect the ground directly to the power leads. The
positive lead would go through regulators and parts
to the ground. So, unless your machine has a direct
short, an ohmmeter should be all that is needed
to determine the negative lead.