what is port 80h in PC?

[Pinczakko]

port 80h

I wonder what this port is for (port 80h) in PC architecture ? is it a debug port ? I mean used for debugging purposes using a POST (power On Self Test) diagnostic card ?

 

[yjkwon57]

port 80h card

The port 80 seems not to be a physical port in a PC, but to be a TCP/UDP port used by the HTTP protocol.

 

[House_Cat]

i/o port 80h

Port 80h is the hardware debug I/O port.

Power On Self Test (POST) sends results for each test in coded form to port 80h.

 

[Pinczakko]

Port 80h is the hardware debug I/O port.

Power On Self Test (POST) sends results for each test in coded form to port 80h.

hmm... really interesting, can you please explain more on this. And is this port is the one which is used by a "special card" called the POST card as I mentioned above?

 

[House_Cat]

Yes, it is the port used by the special diagnostic cards.

A listing of the typical POST error codes for Award/Phoenix Bios can be found at:
**broken link removed**
or
https://www.elhvb.com/mboards/OEM/Mitsubishi/misc/postcode.pdf

A do-it-yourself POST card example can be found at:
https://members.tripod.com/~bbright/information/postcard.htm

Do a Google web search - there is lots of info out there.