Malvineous wrote:

You can order one online - here's a continuity tester, which is like a multimeter but without all the other functions, only the […]
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chrisNova777 wrote:

but for me, its not a priority to go out + get the multimeter

You can order one online - here's a continuity tester, which is like a multimeter but without all the other functions, only the function you need for this issue:

http://www.ebay.com/itm/131589714060

It's US$0.93 with free shipping. 93 cents! Delivered to your door! It will cost you 93 cents to solve your PS/2 port pinout problem and you don't even have to leave the house.

When you get it, you stick it in one of the holes in the PS/2 socket, and hold onto it with one hand. Then you touch each wire with a finger on your other hand until it beeps or the tiny LCD screen changes. When it does, you know that wire goes to that pin and you write it down. Then you repeat for the rest of the holes in the socket and all up it will take you a minute or two, then you'll know the pinout for certain.

chrisNova777 wrote:

i still havent got a multimeter + i still have no idea which wire color is which

🤣 🤣 🤣

Thanks @chrisNova777 your picture was the final nail that solved it for me .. it made PS/2 mouse work on my ABIT AB-SM5 !

Big picture of the hidden (and misleading) silkscreen ..

.. same horse shoe style header but the pinouts in the manual can't be made sense of, they don't seem to match up with the silkscreen.

I can confirm it works with @chrisNova777's pinouts below.
Pin 1 isn't marked for this specific header making it that much more difficult to figure out.

One tip I have is to measure where you can actually get +5V from the header, this is what narrowed it down for me.
I mistakenly reversed to -5V a couple of times switching the pins .. keyboard usually locks up in chkdsk or even in the BIOS if you have it wrong.

From the manual:

1Model name SM5 (J4) SM5-A (JP3)
2Pin number Name of the signal or signification
31 Mouse data
42 No connection
53 Ground
64 +5VDC
75 Ground
86 Mouse clock

What actually works:

1o Vcc   o
2o
3o DATA
4o GND   o CLK

I didn't have a premade PS/2 bracket but I had other parts from an old project.
So I improvised a little with hot glue and an unusued COM bracket 😉