Maybe of some help:
http://www.os2museum.com/wp/have-you-seen-this-board/

I didn't read through...

Overall looks like a nice board 😀

American Megatrends was/is a huge system and keyboard BIOS provider. You'll find the name on a lot of chips of various manufacturers.
If you manage to fire it up it may spit out a BIOS string (on the POST screen) which you can use to find the manufacturer.

Also this doesn't look like it will give problems when figuring out the jumpers.
Top left 3-pin is probably to choose between internal and external battery. Top left 4-pin is external battery - you can find the negative terminal with a multimeter. J4,5,6,11,12 are cache related and documented.

The only three remaining undocumented jumpers are for the clock chip. It will give you 8 different clocks (the chip can actually generate 16: http://pdf1.alldatasheet.com/datasheet-pdf/vi … 07C-03CS14.html).

You can try the different combinations and note the frequency on the boot screen.

Edit: There is also J18 - it might be CMOS clear.

kixs wrote:

Maybe of some help: http://www.os2museum.com/wp/have-you-seen-this-board/ […]
Show full quote

Maybe of some help:
http://www.os2museum.com/wp/have-you-seen-this-board/

I didn't read through...

Overall looks like a nice board 😀

Hey,

Thanks for the link... lot's of good info I did not yet know.

The SIS chipset was designed for 486 systems but had 386 compatibility!

h-a-l-9000 wrote:

Also this doesn't look like it will give problems when figuring out the jumpers. Top left 3-pin is probably to choose between in […]
Show full quote

Also this doesn't look like it will give problems when figuring out the jumpers.
Top left 3-pin is probably to choose between internal and external battery. Top left 4-pin is external battery - you can find the negative terminal with a multimeter. J4,5,6,11,12 are cache related and documented.

You can try the different combinations and note the frequency on the boot screen.

Edit: There is also J18 - it might be CMOS clear.

Thanks for the reply.

I should be ok with cache and frequency select... it was more to switch between the PGA socket and the QFP package, i'll quickly check the bios just in-case there is a software setting, though i'm pretty sure any hardware change to re-route CPU etc would require a jumper change.

I'm sure if I play around with the least obvious one's I may find it.

Thanks again

You may have to unsolder it...

h-a-l-9000 wrote:

You may have to unsolder it...

If all else fails, I may have to...

I'm just glad a PGA socket is already in place!

h-a-l-9000 wrote:

Top left 4-pin is external battery - you can find the negative terminal with a multimeter.

I may use a multimeter to test continuity between each pin of the PGA and QFP... i.e. pin 1 is connected with pin 1 etc. This I think being the case and with no other jumper switching between them, I will then most certainly have to remove the QFP.