Macintosh Portable - test-drb@ccmp.vtda.org

27 Nov 2016

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-request at
classiccmp.org wrote:

 ------------------------------

 Message: 6
 Date: Sat, 26 Nov 2016 16:26:43 +1000
 From: Chris Pye <pye at mactec.com.au <mailto:pye at mactec.com.au>>
 To: "General Discussion: On-Topic and Off-Topic Posts"
 	<cctalk at classiccmp.org <mailto:cctalk at classiccmp.org>>
 Subject: Macintosh Portable
 Message-ID: <00D543B1-7E32-40DE-8829-91E3EBFCBF4A at mactec.com.au
<mailto:00D543B1-7E32-40DE-8829-91E3EBFCBF4A at mactec.com.au>>
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 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...