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.
I hope this helps. smp -- Stephen M. Pereira Bedford, NH 03110 KB1SXE > On Nov 27, 2016, at 1:00 PM, cctech-requ...@classiccmp.org wrote: > > ------------------------------ > > Message: 6 > Date: Sat, 26 Nov 2016 16:26:43 +1000 > From: Chris Pye <p...@mactec.com.au <mailto:p...@mactec.com.au>> > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk@classiccmp.org <mailto:cctalk@classiccmp.org>> > Subject: Macintosh Portable > Message-ID: <00d543b1-7e32-40de-8829-91e3ebfcb...@mactec.com.au > <mailto:00d543b1-7e32-40de-8829-91e3ebfcb...@mactec.com.au>> > Content-Type: text/plain; charset=utf-8 > > Does anyone know off hand what polarity that Mac Portable requires? I know > that the original was 7.5V @ 1.5A, but not sure of the polarity. > > I did have have a PB100 power supply that I used with mine, but > (unfortunately) no longer have it. > > Also (if it still works) what is the easiest way to image the old Conner SCSI > drive? It doesn?t appear to have a standard connector. > > I have googled this, but didn?t come up with anything useful. > > > Thanks, > Chris... > > >
