Macintosh Portable

[Chris Pye]

> On 28 Nov 2016, at 4:49 am, Stephen Pereira <spereira1952 at comcast.net> wrote:
> 
> I am not certain exactly what you mean by polarity in this case, but I’m guessing that you are asking which contact is positive and which is negative.
> If that’s the case, the center socket is positive, and the outer jacket band is negative.

Thank you, that is exactly what I needed to know.