News from Mac OSX - Mysterious Serial Port

[Stephen Quinn Barncard]

All you want to know about MAC serial ports:
http://francis.courtois.free.fr/jc1/serial/main.html

>Hi Dar,
>
>I'd like to try making one of these loop-back circuits. I'm pretty 
>neat with a soldering iron, but I'm not sure how to proceed. I guess 
>I just need the join the Tx pins to the Rx pins but which pins are 
>they? How did you do it?
>
>Cheers,
>Sarah
>
>On Friday, August 22, 2003, at 12:29  pm, Dar Scott wrote:
>>
>>It is also possible to make a loop-back circuit so that you can 
>>read what you write.  You might even still be able to buy one.  If 
>>you have any old Mac serial cables, you can make one from that.