We had a thread on this a few months ago, have a look. Replacement for Chaintech 5AGM2 bracket?

I ran a K6-2+ 450 @ 500 MHz on mine years ago, so I left it at 2.2 volts and didn't worry about it. Though default voltage would be better, .2 over isn't really much of an issue. Sphere478 has done a bit of work on this sort of thing, and he found that on some SS7 boards, taking all of the jumpers off the voltage setting pins can give you an undocumented lower voltage setting. This would be something that you would have to verify with a meter. Worst case, 2.2 should be fine.

Thanks for the link.
I saw that the OP managed to get an adapter bracket with a connector that has 2mm pitch but it was not mentioned where he bought that.

Also, I’m still wondering if I can remove the AT keyboard socket and solder in two PS/2 sockets.
Would that just work or does it require additional modding?

Regarding the CPU voltage, I agree that the slight over-volt should be okay but I’d prefer to configure the correct voltage if I can.

From the photo on the Retro Web it appears that your board has an EL7571 voltage regulator chip. The voltage settings in the Chaintech manual follow the settings in the overview on page 12 of the regulator spec sheet. On the bottom half of the overview you find all the possible settings. See attached spec sheet
No jumpers at all will signal [no cpu]. You could try the setting for 2.0 volt too but it is uncertain if that wil work because the fifth jumper may not be made functional on that motherboard. But 2.1 or 2.2 volt is really no problem for this family of cpu's.

PARKE wrote on 2025-02-17, 12:17:

From the photo on the Retro Web it appears that your board has an EL7571 voltage regulator chip. The voltage settings in the Cha […]
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From the photo on the Retro Web it appears that your board has an EL7571 voltage regulator chip. The voltage settings in the Chaintech manual follow the settings in the overview on page 12 of the regulator spec sheet. On the bottom half of the overview you find all the possible settings. See attached spec sheet
No jumpers at all will signal [no cpu]. You could try the setting for 2.0 volt too but it is uncertain if that wil work because the fifth jumper may not be made functional on that motherboard. But 2.1 or 2.2 volt is really no problem for this family of cpu's.

The attachment Naamloos.jpg is no longer available

The attachment EL7571.PDF is no longer available

This is why I joined Vogons. Always someone to teach us newbies something new.

Thank you so much for that info. I think 2.1V will be perfect. It’s the same voltage that I had to set on my Asus P5A-B which does not work on 2.0V either.

I have a 1.6v cpu on ASUS P5A @ 2.1v and there is really no problem, it does not even get very warm under 'normal' use.

byte_76 wrote on 2025-02-17, 11:27:

Thanks for the link. I saw that the OP managed to get an adapter bracket with a connector that has 2mm pitch but it was not ment […]
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Thanks for the link.
I saw that the OP managed to get an adapter bracket with a connector that has 2mm pitch but it was not mentioned where he bought that.

Also, I’m still wondering if I can remove the AT keyboard socket and solder in two PS/2 sockets.
Would that just work or does it require additional modding?

Regarding the CPU voltage, I agree that the slight over-volt should be okay but I’d prefer to configure the correct voltage if I can.

You might try sending him a private message and ask him where he purchased it. Now that you know it exists you know what to look for. There is always the possibility to do what I did if you have some dead CDROMs to salvage the connectors.

I've no advice on the idea of replacing the AT keyboard port with a PS/2 - there are other members of Vogons who might.

byte_76 wrote on 2025-02-17, 11:27:

I saw that the OP managed to get an adapter bracket with a connector that has 2mm pitch but it was not mentioned where he bought that.

When you google [female connector 2mm pitch 8ways double row] you get a couple of options. Molex is one of them, see attached. Whether they fit on the cables of the adapter is an open question.

PARKE wrote on 2025-02-18, 12:52:

byte_76 wrote on 2025-02-17, 11:27:

I saw that the OP managed to get an adapter bracket with a connector that has 2mm pitch but it was not mentioned where he bought that.

When you google [female connector 2mm pitch 8ways double row] you get a couple of options. Molex is one of them, see attached. Whether they fit on the cables of the adapter is an open question.

The attachment 0900766b813c3ed3.pdf is no longer available

That molex connector does not look like it will fit.

I have ordered some female header pin connectors and will make up the USB and PS/2 adapter brackets that I need.

Another option that I would not mind trying is to remove the AT keyboard DIN socket and solder in green and purple PS/2 sockets as there seems to be solder points on the board for those.
I’m not sure whether that would work though, and would not want to do that unless I’m really quite confident that it would be successful. (The backplate isn’t really an issue because I don’t have an AT case anyway so I’ll just make a plan with an old ATX case)