parallel and serial port input/output

["Dan Anderson" <dan1625@earthlink.net>]

Hello,

 

What is the best way to communicate directly with the serial or parallel ports?  I looked through documentation and found this for creating custom ports.  Is this used for serial and parallel io?

(make-input-port    read-char-proc    char-ready?-proc     close-proc     [peek-char-proc])

 

Also I found, (system....) which executes a system command.  If possible I would like to communicate directly with com1 and lpt1.  What would you recommend?

 

 

The information

Dan