Several packages for working with COM-port and LPT-port from different authors.

 

I.ComPort: Object for working with a COM port, with a visual mirror (plus a bonus in the form of a visual LED control, like a light bulb). Written by Vasily Pivko.

II.MHComPort: Another component for working with a COM port. Author Dmitry Zharov aka Gandalf.

III.ForLPT: Object for working with LPT port in Windows 9x / ME operating systems. Author Alexander Rabotyagov.