Subject: The definitive answer to the apple//c PC connection by serial cable !
From: "Gianni Barberi" <gianni@unforgettable.com>
Date: Mon, Nov 16, 1998 16Ç44 
Message-id: <72qdo2$lb0$1@menelao.polito.it>

After much debate and suggestions in the newsgroup I finally connected the
two and they're talking fluently via ADT.
The answer is the most obvious: just connect Transmit Data to Receive Data
and viceversa. Join Ground as well is a good thing, but I did transfer ADT
on my Apple with just 1 wire !
I found it in the most empirical way: shuffling the wires till some garbage
came on the screen.
So I discovered as well that Apple used his own numbering on the DIN plug, a
very wise move: probably we all would be using Apple now if they just
followed the standards.

Here are the connections, you can read the pin numbers on all the plugs.

Apple // c DIN        PC DB9        PC DB25

5                           2                  3
4                           3                  2
2                           5                  7

That's All Folks !