I've always just connected AT psus to non-branded xt mobos and never had an issue... you can always check that pin2 with a multimeter

I have a connector exactly like this in my Samsung XT clone, except pin 2 is actually missing from the connector.

The original PSU in that machine also uses weird non-standard colors (green for ground, for example) but I double checked the pinouts and everything lines up.

For me, that machine worked with AT-style power without issue (even with an ATX->AT converter). I did have to snip off the longer bits from what you call the "mechanical coding" to make it physically fit.

Most likely pin 2 is connected to nothing on the PCB. I would check that, and if you are still unsure you could always snip pin 2 from either the connector on the motherboard or the corresponding cable from the power supply.

Side note: these connectors REALLY SUCK. I'm glad they didn't use them for long, removing the cable from them is a real exercise in tedium... 😠

My XT has been mounted in a AT case and it seems to have been working fine since 1988, so this should work without any problems ^^

This is regular AT PSU connector. It was just cheaper non-keyed variant which was widely used on cheap motherboards. Electrically it's 100% the same, but it allows connecting the P8 and P9 connectors the wrong way so watch out.

Would you care sharing a good quality picture of your motherboard? It looks like it's almost the same as my KT 10 M/B we are trying to fix in this thread...

Thanks for all the replies. I used some brute force and managed to connect the PSU to the mobo and everything works fine so far - It's nice to have my XT back 😀

Here is a picture of the motherboard: It's an Octek 10Mhz Turbo Board.

Pic was taken with my phone camera but I'll add a better picture shot with my DSLR as soon as I have access to my Lightroom PC.

I also have the manual for this board with the schematics in the appendix. I've scanned it as a PDF and tried uploading it to this post but the server won't let me as the file is over 5Mb. Let me know if you want me to send it to you directly.

She's a beauty!
Also the OCTEK is probably my favourite brand from this era...
Looks just like mine Turbo XT just with less RAM chips...

Can I have that manual too ? 😁

Also actually I wonder if Baby AT isn't just AT class motherboard designed to fit into XT cases ? Because real AT motherboard and cases are quite crate nowadays.

MMaximus wrote:

I also have the manual for this board with the schematics in the appendix. I've scanned it as a PDF and tried uploading it to this post but the server won't let me as the file is over 5Mb. Let me know if you want me to send it to you directly.

Please! Please please! I will help alot fixing my motherboard I think… if not through the forum, then mail maybe: h*******r@g***l.com. Thanks!

PS: Also mega.nz is great file hosting/sharing service 😀

Thanks for the info about mega.nz. I've just created an account, hope it's safe to use. In the mean time you might want to edit your last post to remove your email address unless you're not afraid of spam 🤣

Here is the link to the pdf manual

Hope the manual will be useful. I've just checked it once again I actually don't know if it contains schematics or if it's just a diagram. Hope I didn't give you false hope 😦

MMaximus wrote:

Thanks for the info about mega.nz. I've just created an account, hope it's safe to use. In the mean time you might want to edit your last post to remove your email address unless you're not afraid of spam 🤣

Here is the link to the pdf manual

Hope the manual will be useful. I've just checked it once again I actually don't know if it contains schematics or if it's just a diagram. Hope I didn't give you false hope 😦

Thanks! It doesn't contain schematics actually, just general layout of the motherboard, but it's interesting anyway.

I wouldn't keep confidential data on mega.nz but for sharing big files it's perfect.

PS: I don't care too much about spam hitting this e-mail as it's spam account…