C# Todo sobre puertos Serial(COM) y Paralelo(LPT )

How to program Read,Write parallel port in C#?
http://sandeep-aparajit.blogspot.com/2008/08/io-how-to-program-readwrite-parallel.html

Parallel port
http://www.epanorama.net/circuits/parallel_output.html
http://www.epanorama.net/circuits/parallel_output_es.html

I/O Ports Uncensored - 1 - Controlling LEDs (Light Emiting Diodes) with Parallel Port
http://www.codeproject.com/KB/cs/csppleds.aspx?df=100&forumid=21021&exp=0&select=974134

I/O Ports Uncensored Part 2 - Controlling LCDs (Liquid Crystal Displays) and VFDs (Vacuum Fluorescent Displays) with Parallel Port
http://www.codeproject.com/KB/cs/cspplcds.aspx

How to Capture LPT Port(s) to Intercept DOS Print Requests
http://www.codeproject.com/KB/system/LPTCapture.aspx

Recursos:
Lpt Monitor y muchos otros muy útiles
http://neil.fraser.name/software/
Com Monitor
http://www.serial-port-monitor.com/
Drivers para dispositivos varios controlados por puertos LPT o COM
http://www.kitsrus.com/software.html