Setup for MAC OS X 10.4 Intel

1. Connect the serial port to USB converter, install the correct drivers
   and set it up in Mac's network screen found in 
   Applications > System Prefernces > Network 
   Reboot the computer

2. Start tclsh in a terminal window

tclsh

enter in the following:

%fconfigure stdin

 if "-mode" does not appear then TCL/TK does 
 not have serial port support.
 
 if "-mode" appears you are done and can use TCL/TK with serial ports

3. Go to the active state web site to download 
   the universail binary for Mac OS X

http://www.activestate.com/Products/ActiveTcl/
read the install instructions at: 
http://aspn.activestate.com/ASPN/docs/ActiveTcl/8.4/at.install.html
for MAC OS X.
  
4. As root (sudo su) go to /usr/bin and move the links @wish and @tcl 
   along with there linked files to a different name
   or directory. ActiveState TCL installs the links in 
   /usr/local/bin

5. Install Active State TCL in Mac OS X

6. reboot

7. Repeat step 2 if "-mode" appears then you 
   have serial port communications and you are done.

8. If you don't have serial port support REMOVE
   the active state TCL binary following Active State TCL directions.

http://aspn.activestate.com/ASPN/docs/ActiveTcl/8.4/at.install.html#uninstall

9. Move back the original @wish @tclsh and linked files to /usr/bin. 
    Your Mac System will not support serial port communications.