Description:	Testing the computer ports
Platform:	Windows Xp
If you want to se if you ports are working properly do the fallowing: Start --> Run --> type "debug" and press ENTER then type D40:0 and again press ENTER. The first line will look something like: F8 03 F8 02 E8 03 E8 02-BC 03 78 03 78 02 C0 9F . Here is how you interpret it: F8 03 --> COM1; F8 02 --> COM2; E8 03 --> COM3; E8 02 --> COM4; 78 03 -->LPT1; 78 02 --> LPT2; C0 9F --> LPT3. If you see something like 00 00 this means that the port is not working properly. This is very useful to diagnose hardware problems.