Sounds like you are using an old version of [comport].  A much more recent version is included in the next test release:

http://at.or.at/hans/pd/installers.html

.hc

On Jul 18, 2006, at 1:55 PM, Jaime Villarreal wrote:

Hi, I'm new to pd and would like to comunicate via the comport.
I have a very simple patch which tries to send the number 1 to the comport object.
The comport is configured as follows.
     comport $1 9600
Pd reports:
     Opened serial line device  COM1
Ok. That's Good. But when I try to send anything I get,
     Write error, maybe TX-OVERRUNS on serial line

My serial port, COM1, is the FTDI USB serial converter included on the arduino microcontroller board. I have been able to comunicate successfully through the USB converter with other software so I am sure it is not a problem with my converter.

I have taken screenshots of everything that I thought might be related and published them here.
     http://www.intra.org.mx/pd/

If anyone can offer me any advice I'd be very grateful.
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Using ReBirth is like trying to play an 808 with a long stick.    -David Zicarelli