Have a look here: http://arvutimuuseum.ee/th99/#1 (under 286 motherboards).
Look for something distinct about the layout of your motherboard and then see if you can track down yours, based on the schematics.

I went over all of the 286 boards by picture, but couldn't find it.
I searched the ASCII files for matches according to the speaker and battery jumper numbers, but the few hits that I got, were of other boards...
Also tried by bios and chipset.. but no cigar...

Clean this before turning anything on....

Its unlikely to damage anything iwth a wrong jumper setting...but you will not do anything good to that board when turning on in that condition...

Predator99 wrote:

Clean this before turning anything on....

Its unlikely to damage anything iwth a wrong jumper setting...but you will not do anything good to that board when turning on in that condition...

Oh, its much cleaner that it was when I got it 😀

I've been using it for few weeks now, and it works great. But I know.. I really need to clean it seriously.

Was searching for something else, and I fell over this tool: http://www.elhvb.com/webhq/bios.html#ctbios

WOW! Now that's a nice archeological find, where did you dig up this artifact? Also, you aren't using original PSU that came with it, are you?

🤣...I take back what I have written. Astonishing its still working...!

So what Jumper setting are you looking for? I think you dont need to change anything when its running.

brostenen wrote:

Was searching for something else, and I fell over this tool: http://www.elhvb.com/webhq/bios.html#ctbios

Thanks, I'll give it a try soon!

SSTV2 wrote:

WOW! Now that's a nice archeological find, where did you dig up this artifact? Also, you aren't using original PSU that came with it, are you?

Some guy gave a monochrome monitor for free. I asked if he still has the computer that came with it - and he did!
He thought it was an XT computer, but evidently it is a 286 16Mhz. I think that at that time here (Israel), we just called any old computer that had a monochrome card "XT".
And yes.. I use the original PSU. I was shocked that the computer turned on without any problems. I had a fire extinguisher ready...
The fan on the PSU does not run though, so I don't keep it running for too long.
Hopefully I'll get some time soon to give it a much deserved restore.

Predator99 wrote:

🤣...I take back what I have written. Astonishing its still working...!

So what Jumper setting are you looking for? I think you dont need to change anything when its running.

I bought an external battery and wanted to know the polarity of the pins on the board, as the header can be connected either way. In the meantime I took a guess and it seems that the battery works.
But still, would be nice to know some more details on this piece of history 😀

anetanel wrote:

And yes.. I use the original PSU. I was shocked that the computer turned on without any problems. I had a fire extinguisher ready...
The fan on the PSU does not run though, so I don't keep it running for too long.
Hopefully I'll get some time soon to give it a much deserved restore.

I would get that fan fixed or replaced ASAP. Those PSU's can overheat quite quickly.
Normally, it's just a little drop of hair clipper or sewing machine oil that is required on the spindle to get it going again (you need to remove the fan to get to it).

anetanel wrote:

I bought an external battery and wanted to know the polarity of the pins on the board, as the header can be connected either way. In the meantime I took a guess and it seems that the battery works.
But still, would be nice to know some more details on this piece of history 😀

I have seen a documentation/labeling of external battery header only in few cases. If you take a look at other boards at TH99 you will not find the polarity in most cases. I usually measure Pin 1+4 of the header against the 2 Pins of the soldered battery and figure it out this way...

Predator99 wrote:

anetanel wrote:

I bought an external battery and wanted to know the polarity of the pins on the board, as the header can be connected either way. In the meantime I took a guess and it seems that the battery works.
But still, would be nice to know some more details on this piece of history 😀

I have seen a documentation/labeling of external battery header only in few cases. If you take a look at other boards at TH99 you will not find the polarity in most cases. I usually measure Pin 1+4 of the header against the 2 Pins of the soldered battery and figure it out this way...

That's another thing. I couldn't find the battery on this board, except for the external one.