Check out the manual of the board to see if you cannot find the pinout if those serial port. There used to be two serial port header standards back then

I checked the manual and it does not specify what type of serial port it is.
Only COM1 and COM2 and Soyo serial ribbon.

What com port setting do I need in the BIOS to get this to work ?

You cannot change it, it's hardwired. You need to find the correct serial port to connect on these headers

Well, the cable is either staggered or sequential on the port side. Just resolder it the other way around and you're done.

Yes, there are 2 parallel standards in existance...

See here: Serial port breakout bracket not working after motherboard change

Here are the BIOS settings I have available for the serial ports. I tried several RS232 DB9 serial port ribbons but None seem to work.

I repeat, the problem isn't in the configuration, it's just how they wired it up. It's like showing me the BIOS setup where you set up drives for a CD drive using the mitsumi or panasonic interface. Even though they both look like IDE, they'll never work on an IDE port.

GigAHerZ wrote:

Well, the cable is either staggered or sequential on the port side. Just resolder it the other way around and you're done.

Yes, there are 2 parallel standards in existance...

So if I set my bios com port settings to “Auto” it should be okay right.
So if I clip the cable on the connector with that make it “staggered” ?

Intel486dx33 wrote:

GigAHerZ wrote:

Well, the cable is either staggered or sequential on the port side. Just resolder it the other way around and you're done.

Yes, there are 2 parallel standards in existance...

So if I set my bios com port settings to “Auto” it should be okay right.
So if I flip the cable on the connector with that make it “staggered” ?

No to both questions.

Look at this image.
Which diagram is staggered ?

You can not just grab a connector, it needs to be the same pinout as the board. Finding the right one can be hard. Check your manual and use a multimeter.

I think this is what I am looking for.
http://www.frontx.com/pro/cpx102_2.html

And this

Hey it's not rocket science, now that I have more time let me explain.

This is the pinout of a DB9:

11 2 3 4 5
2 6 7 8 9

This is what a Linear header looks like:

11 2 3 4 5
26 7 8 9 0

This is what a Staggered header looks like:

11 3 5 7 9
22 4 6 8 0

Now get a multimeter, go to continuity mode, hold one terminal to the Pin 2 of your non-working cable's DB9, then use the other terminal to determine which location it is connected to. This will tell you whether it's Linear or Staggered. If it's Linear, get a Staggered header. If it's Staggered, get a Linear header.

If you work out that you need a Staggered cable replacement, you are in luck because that is the later standard and is often found on mid-late Pentium boards so 90% chance anything NOS you order online will work. If you find you need a Linear cable replacement, you will have to scavenge your parts bin or ask around because I don't think you can reliably find and order one.

Okay, I have some Rasberry pi wires that I can hook up to the serial ribbon to find out the pin-outs using a voltage meter. Then can cut the serial ribbon in half and solder up the wires correctly as to the diagram.
Easy fix.

Intel486dx33 wrote:

Okay, I have some Rasberry pi wires that I can hook up to the serial ribbion to find out the pin-outs.
I am also going to use these rasberry pi wires to create a new ribbion mod.

Let us know how that works; the dupont jumper wires should do the trick, but if you have a solder type DB9 you will have to cut off the male ends, strip them and solder them onto the DB6. There are things like this you can get away with without soldering, though I'm not sure how good an idea that is:

Take the plastic part off from the port side (the side that mounts to a case) and just rewire it the other way around. There are 2 options, how it is wired currently and you just need the other option...

I think I will try these connectors they seem simple enough.
I can just cut off the old DB9 connector and add this NEW one to the ribbon.