40-0400-428036-00101111-121291-UNICHIP-F

[Mick]

within this foruml I'd like to request if you could help me in the identification of a motherboard manufacturer.
I tried the amibid tool. But this did not deliver any info.

On the surface of the chip the following code is visible:
AMIBIOS
American Megatrends
486DX ISA Bios (c) 1992
AA 0916676

during the boot sequence on the screen appears:

American Megatrends Inc.
40-0400-428036-00101111-121291-UNICHIP-F

Kindly let me know, if you can help with any further information.

[ajzchips]

These people might help you:

http://www.unichip.com.tw

They seem to be the manufacturers of your chipset.

[edwin]

Gemlight/DTK board, one model with this chip, the GMB-486UNP:

http://th99.piloti.dyndns.org/m/E-H/33912.htm

[Mick]

Hi Edwin,

sorry that I'm answering late. I must apologize for that...
Unfortunately the figure of the motherboard you posted is not the right one.

Enclosed please find a sketch of the motherboard

regards Mick



edit by edwin: the image in ASCII has been removed. I got it by email, I'll try and put it online somewhere.

[edwin]

Check here:
http://webhqnl.fateback.com/

I think I have got a match with the same chip and largely the same layout.

http://th99.piloti.dyndns.org/m/U-Z/30989.htm

[Mick]

Hi Edwin,

this 486 WB-U1 board fits better, but I think it is not the right one, because on my first sketch there are two electronic components that I didn' t find on your figure 30989-1.png.

I didn't pay attention to the position of the jumpers. But I found a stamping on the back side:

YANG AN YA-1
94 V-0 E 114 139
9237

handwritten (white paint) turned upside down to the stamping

143012


Enclose please find an update to my first sketch related to the 2 electronic parts I did not find on your figure.

Best regards,

Mick

[img]MB_486DX2_2.png[/img]

[edwin]

You will have to put that picture somewhere on the internet if you want the rest of the world to see it. We cannot access your harddisk...

[Mick]

Hi Edwin,

I sent this via e-mail to you ...

Regards

Mick



edit by edwin: putting online means upload the picture to a webpage somewhere and put a link to it. Pasting it here will not work. Note: I just saw my reply-to address is wrong, that should be edwin@wimsbios.net NOT elhvb@wimsbios.net

[edwin]

The Samsung 83C206 is a multi I/O chip, they are often left out of the sketches. If it had been there in the 486 WB-U1 sketch would your board fit? Is that rectangular shape in the sketch in the right place if I tell you it's a metal thingy (crystal oscillator)?