What 486 motherboard is this???

How-to identify your motherboard ?
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Chaly
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Hi!

Recently i bought a secondhand 486 Motherboard. A first I thought it would be easy to get a manual. But now i can''t find out exactly what type of board it is. :cry:
I hope there is someone overhere who can help me!
Here are some specs:

Processor: 486SX,DX,DX2,DX4?? (Socket 3)
Chipset: UMC 8881 8886
Memory: 4x 72-pinns simm
Slots: 4x PCI and 4x ISA

There is also a IDE controller on board, however no floppy,com ports and LPT ports. I have a seperate controller for them.

Award Bios string:04/18/95-UMC-881-886A-2A4X5V31-00, according to wim's biospage it is a Vtech motherboard, but which one?

There is also a code written on the PCB: 70271B 35-8216-01 00063-10

Just above the UMC 8886 cip there is a sticker which says: H24 B1


Here's a picture of it:

[img]http://members1.chello.nl/~g.harten/mob ... _small.jpg[/img]

Here is a picture of the bios string:
[img]http://members1.chello.nl/~g.harten/mob ... string.jpg[/img]

I hope there is someone out there who can help me to find a manual or at least the jumper setting! Thanks in advance! :wink:

Merry christmas and a happy new year!

Chaly[/img]
ajzchips
El cheapo dude
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I have a feeling you're lacking the keyboard controller chip... if I saw the picture correctly.
edwin
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Please explain how he got the bios ID string then. I don't believe a board will boot without a keyboard controller chip...

I think I have got a manual or jumper settings in PDF for this one somewhere. Keep an eye on your mailbox.
edwin/evasive

Do not assume anything

System error, strike any user to continue...
edwin
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Must be a different revision or someone got the manuals mixed up, the one I have here has only 3 PCI slots and all onboard I/O.

We'll have to do another search...
edwin/evasive

Do not assume anything

System error, strike any user to continue...
edwin
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This is weird. I go through the 5 or 6 unscanned manuals I've got. In there there is one called 486UPI by PcPartner. And it is absolutely spot on. Looks like I have to make 19 scans...
edwin/evasive

Do not assume anything

System error, strike any user to continue...
Rainbow
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The UMC UM8881+UM8886 chipset has built-in keyboard controller. I have two boards with this chipset and both have no separate keyboard controller. So the KBC on that board might be an extra option...although don't know for what.
Patched and tested BIOSes are at http://wims.rainbow-software.org
UniFlash - Flash anything anywhere
edwin
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Chaly: scanned manual is on its way...
edwin/evasive

Do not assume anything

System error, strike any user to continue...
edwin
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The rest of the world: it's available for download in 3 parts here:
http://www.elhvb.com/mboards/vtech/486.html
edwin/evasive

Do not assume anything

System error, strike any user to continue...
Chaly
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Thanks for your great help, i'll be watching my mailbox!

I hope i can at last put my dx4 cpu on it!

Man, i love this kind of forums!

Great and many greatings, Chaly :lol: :lol: :lol: :lol:
Chaly
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I'm Terribly sorry :oops: , i forgot to enable viewing of my email adress when i signed up yesterday! It's should be okay now!

Chaly
Rainbow
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edwin: Hint for the future: When saving the scanned images, decrease color depth to 8 or even 4 colors and then save as PNG. The resulting files will be smaller than JPGs with better quality (lossless compression).
Patched and tested BIOSes are at http://wims.rainbow-software.org
UniFlash - Flash anything anywhere
edwin
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I forgot: everybody in the world has MS IE these days :roll:
edwin/evasive

Do not assume anything

System error, strike any user to continue...
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