Before My computer Got Stolen I had a really good reference manual in Hypertext format; possibly pdf format.
it was called the Hardware Information Handbook or the Hardware Resource Handbook and It detailed all the different Ports for computers and the wiring of the Ports as well as many other detailed bits of Information.
It was the project of one man who wanted to amass all this computer Info
and publicize it.
I have tried the search engines and I cant turn up the file.
If anyone knows what I am talking about Please point me to the correct website.