sounds good.
yep.

Only pin 2 has 5 volts.

Now what?

ux-3 wrote on 2024-06-27, 17:27:

This is a SS7 mainboard (IN530). The USB onboard connector looks like this. X has no pin.

I s it this mainboard?

https://theretroweb.com/motherboards/s/bcm-in530#docs

https://theretroweb.com/motherboard/manual/in … e2915258248.pdf
P.33

Any use of this front/back selection?

My feeling is that you either use back panel USB or select internal cable but disabling back USBs.
You don't have 4 USBs, only 2.

Yeah, looks like it from this https://theretroweb.com/motherboard/manual/36 … f9391420789.pdf

Yes, it is that mainboard. And yes, I only have 2 USB ports. They do work, I checked the back.
And yes, I have switched to front USB, using those two jumpers. However, I don't know the pinout of the onboard connector.

The front header is 2x5, as I depicted, with one missing pin. And only one pin (#2) carries 5 volt, no matter how I set up USB.

How can I determine the pinout without destroying the USB?

Don't know how applicable it is but it does ring a bell for me regarding a mainboard I have which has two usb ports on the back and a usb header on the mainboard and jumpers for the usb which allow one port to be switched from the back to the usb header, the usb header which allowed for one front usb port .

The alternate names for the mainboard you have also reminded me. I think it was a packard bell one with bad capacitors.

Would be nice to see a clear photo of the original computercase front, sides & back.

The case was too ugly, it died decades ago.
But you may have a good point. Perhaps one port stays active in the back. I can check that.

Edit: good catch. enabling front disables one in the back. Now it makes more sense...

OK, I managed to find the 2 USB header pins that are connected to the front/back jumpers, pin 6 and pin 8. So these are most likely the data lines. But which is which?

Several of the header pins are unter 1 ohm to the NT-case. So probably ground.

Got it, works!

Solution edited in first post,
many thanks for all who helped!

Glad you got it working. I had a MS6147 from a Packard Bell (might be the same as weedeewee's) with a similar setup: 6 pin header to switch one of the USB ports from the back panel to a 10 pin internal header.
https://theretroweb.com/motherboards/s/msi-ms-6147-bx7#docs

Looks like the pinout was nearly the same as yours, although with pin 4 as well as pin 10 missing and the D+/- the other way around, assuming I measured mine correctly: https://theretroweb.com/motherboard/manual/pb … e5192336815.pdf

Anyone know if this was some sort of standard for a single port front panel USB port? Or a specific PB thing?

snufkin wrote on 2024-06-28, 16:21:

the D+/- the other way around

Actually, yours is right, I made a mistake when I wrote it up. I only moved the white P- from next to 5V two pins down the connector.
They are the same.

ux-3 wrote on 2024-06-27, 17:27:

This is a SS7 mainboard (IN530). The USB onboard connector looks like this. o is pin, x is no pin. 2 4 6 8 10 o o o o x o o o o […]
Show full quote

This is a SS7 mainboard (IN530). The USB onboard connector looks like this. o is pin, x is no pin.
2 4 6 8 10
o o o o x
o o o o 0
1 3 5 7 9
Later USB 2.0 connectors have the pin shifted to the bottom row.
Solved:
2: 5V
6: Data+
8: Data-
9: GND

My plan would be to check pin 1 and 2 for +5V vs 7 and 8 with power on. Or find the pins with +5V vs chassis.
Then check if 7 and 8 have 0 ohm to ground with power off.

If I reverse hook up the P+ and P- data lines, what will happen? No function?

Thanks for posting this, it allowed for me to use the front panel USB ports in my InWin CA-V500 with one of these boards. Here is a diagram I drew up. I found that pins 3 and 7 are also grounded, as all three mentioned ground pins have continuity with the PS/2 connector shield.

BTW, love the Sitting Ducks PFP.