I'm not seeing the connector for that add-on card on the photo of your motherboard. Are you sure that add-on board is correct for your motherboard. The only connector I do see on the rear edge between isa and pci is for the sound connectors if memory serves me right.
Also
You could add a 8-2 pin layout (6pin) next to the keyboard connector (in the silkscreen of ps2mouseconnector) to which you could add a ps2 mouse connector, or a pin header to a ps2 mouse connector on a cable.

ps. I really really really really really really really really really dislike any pentium2 and newer pcchips boards.

The J4 connector is under the AGP slot. If you can get a pin diagram you can probably try just running hobby wires directly to a PS/2 connectors. The picture you posted has some capacitors and resistors on it, and I am not PCB expert at all, but they look like most of the business is on the wires leading to the USB ports. The PS/2 lines look pretty clean.

EDIT: Serial mice aren't expensive at all, they just suck. You can even find optical serial mouse if you really want.

weedeewee wrote on 2021-03-15, 19:53:

I'm not seeing the connector for that add-on card on the photo of your motherboard. Are you sure that add-on board is correct fo […]
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I'm not seeing the connector for that add-on card on the photo of your motherboard. Are you sure that add-on board is correct for your motherboard. The only connector I do see on the rear edge between isa and pci is for the sound connectors if memory serves me right.
Also
You could add a 8-2 pin layout (6pin) next to the keyboard connector (in the silkscreen of ps2mouseconnector) to which you could add a ps2 mouse connector, or a pin header to a ps2 mouse connector on a cable.

ps. I really really really really really really really really really dislike any pentium2 and newer pcchips boards.

The manual says to connect it at J4, between the PCI and AGP slots.

Thank you! I did not know about that ps2 connector, the manual does not show anything there. Anyway to also add USB support?

Steapa wrote on 2021-03-15, 20:07:

The manual says to connect it at J4, between the PCI and AGP slots.

Thank you! I did not know about that ps2 connector, the manual does not show anything there. Anyway to also add USB support?

Oh okay ! Good, I didn't see that on the photo.
and yes, reverse engineering that should be easy. 2x2 signals for the USB ports and 2x2 signals for the PS2 ports, and the rest for ground and 5v. if you have a multimeter you could measure for continuity on the pins, ps2mouse and keyboard connector and the ground and 5v lines. only guesswork would be the D- and D+ usb lines. which would be as easy as connecting a device, detected is good, not detected is switch two wires and try again. there's only two possiblities for that. times 2 since there's two ports.

Heck, I think you can even add one of those 2 usb ports on a backplate addons to it, then you'll only need to get a ps2 connector for the mouse and /or keyboard.

This website shows the pinout of an ATX Form Card. It looks physically like the one on your board, but lists an IR header as well as PS/2 and USB.

https://www.interloper.com/products/details.p … =101688&cat=141

Sorry in advanced that it's on a retailer's product page.

Actually now that I'm searching online, I've seen a number of retailers that carry these cards/slots. The lowest priced one I found sells for $8 US. It might cost you less to buy and ship one of these rather than make one with individual parts.

fosterwj03 wrote on 2021-03-15, 20:14:

This website shows the pinout of an ATX Form Card. It looks physically like the one on your board, but lists an IR header as well as PS/2 and USB.

https://www.interloper.com/products/details.p … =101688&cat=141

Sorry in advanced that it's on a retailer's product page.

Cool find, that pinout seems like exactly what OP needs.

mothergoose729 wrote on 2021-03-15, 20:03:

The J4 connector is under the AGP slot. If you can get a pin diagram you can probably try just running hobby wires directly to a PS/2 connectors. The picture you posted has some capacitors and resistors on it, and I am not PCB expert at all, but they look like most of the business is on the wires leading to the USB ports. The PS/2 lines look pretty clean.

EDIT: Serial mice aren't expensive at all, they just suck. You can even find optical serial mouse if you really want.

Sorry, my English sucks. I was trying to say that the cards are expensive(at least for me), not the mice.

weedeewee wrote on 2021-03-15, 20:12:

Steapa wrote on 2021-03-15, 20:07:

The manual says to connect it at J4, between the PCI and AGP slots.

Thank you! I did not know about that ps2 connector, the manual does not show anything there. Anyway to also add USB support?

Heck, I think you can even add one of those 2 usb ports on a backplate addons to it, then you'll only need to get a ps2 connector for the mouse and /or keyboard.

Ok, I'll try it and post my results here.
I'm doing this because I can buy everything I need locally. The only sites that ship to my country are Amazon, Aliexpress, and eBay, but the tariffs/shipping costs are too high.

Thank you, everyone.