At 08:53 PM 9/12/02 GMT, you wrote:
>All the commercial LocalTalk and Phonenet adaptors contain an isolating
>transformer, which is carefully designed to preserve nice clean square
>waves from one side of the interface to the other. Note that you can't
>just use any old small transformer! There's a web page describing the
>innards at
>
>http://ground.ecn.uiowa.edu/apple2/MiscInfo/Hardware/appletalk.phonenet
-snip-
Thanks Pete! Excellent links. By the way, I had found an apple
PDF file documenting most ports, but the serial mini DIN8 connector
shown in page 2 seems to be have the wrong pin numbering; according
to my own measurements, pin 4 is actually closer to pin 3 than
to pin 5; if the pins were numbered in right to left, bottom-up
order the picture would be right:
http://www.apple.com.pl/infotech/varia/Ports/Ports_Pinouts.pdf
(2MB download)
The document that you referenced shows a numbering that is in accord with
my own measurements. A case of an official document being wrong and a
hobbyist-produced document being right.
--------------------------------------------------------------
Carlos E. Murillo-Sanchez carlos_murillo_at_nospammers.ieee.org
Received on Thu Sep 12 2002 - 23:55:01 BST