Is the form card explicitly for this motherboard? If the pins for the card don't exactly match the pins on the motherboard you'd have exactly this type of situation. I had a look at the manual, and it's really no help because rather than giving you the pin schematic it just says "Form card goes here" which is no help if you want to make sure that the wires are in the correct order.

In another thread on Vogons, someone linked to a form card that shows the pin out and it's hopefully what your board has: Re: AT-Mainboard: Matsonic MS6260S BIOS with Patch possible?

If you have a volt meter you should be able to confirm this chart's correct.

The AT/ATX motherboards I've used have had working USB and PS/2 ports regardless of which type of power supply I used, and the trusty old P55T2P4 had working USB ports even though it only had an AT power connector.

There was a thread somewhere where they were trying to reverse engineer these cards. It was within the past year or so, but I can’t recall enough details to search it. (Not the one repo linked)

Start by mapping out the power and ground pins on the header. Make sure those match the card. (As repo suggested) then go from there.

If you say it is a clone board maybe flashing the other bios can enable the card option?

But the boards I have with this, the usb worked without a option like described in bios (I think there was a usb enable/disable option though obviously) and separately a ps2 mouse enable/disable option.

Same here, PC Chips M590 and ATX form card (original, supplied with mobo) works flawless without any settings in the BIOS. AT or ATX supply - both have +5V rail that powers USB and PS/2.

Thanks for the help guys. So turns out it does, sorta work. My dummy self didn't realize that PS/2 isn't hot swappable (I haven't messed with ps/2 since I was a kid). Plugged the mouse in before booting and it works great.

Still haven't figured out if the USB works or not. I'm assuming it's 1.0 or 1.1. The only things I've tested it with so far are a flash drive (with drivers installed from Phil's website) to no avail. Also tested a random USB optical mouse to no avail as well, but these are both newer USB 2 or maybe 3 devices, that might not work with 1.0, not sure.

Getting a PS/2 to USB adapter for my newly thrifted Model M keyboard, we'll see if that works, as it's definitely old enough.

is the usb getting power?

have you enabled usb in bios? there is usually an option.

Sphere478 wrote on 2022-08-30, 06:44:

is the usb getting power?

have you enabled usb in bios? there is usually an option.

Aw man. It was enabled. Before I got the ATX form card. I changed the CMOS battery and completely forgot that it defaults to off.

All is well now. *facepalm*

Haha. W00t!

Blaeeeek wrote on 2022-08-30, 06:40:

Still haven't figured out if the USB works or not. I'm assuming it's 1.0 or 1.1. The only things I've tested it with so far are a flash drive (with drivers installed from Phil's website) to no avail. Also tested a random USB optical mouse to no avail as well, but these are both newer USB 2 or maybe 3 devices, that might not work with 1.0, not sure.

USB 1.x, 2.0 or 3.x is not important for devices like mouse or joystick/gamepad, only for data transfer and its speed.