TK 8881 FA20 = TB-486-OB = TD-4IP-UMC-AIO

How-to identify your motherboard ?
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The UniFlasher
Posts: 3122
Joined: Wed Mar 20, 2002 4:16 pm
Location: Slovakia

I got TD-4IP-UMC-AIO board. It looks exactly like one of the ADI boards at Edwin's page.
The only exception are the fake cache chips with "WRITE BACK" on them.

Fake cache chips removed:

The BIOS had 27C1024 printed on it, nothing else - but it showed "Updating ESCD... Success" before boot. After rubbing with alcohol, the 27C1024 text disappeared and something other appeared. Again some rubbing, the second text disappeared too. Looks like there's Winbond there - but very well covered :)

The BIOS ID string is "12/19/95-UMC-881E/886B-2A4X5CF9C-00" and some sites dentify it as FordLian 9885AW board.

I'm going to install sockets for real cache there. I also want to make UniFlash support for the UMC chipset...too bad that there aren't any datasheets :(
Patched and tested BIOSes are at
UniFlash - Flash anything anywhere
El cheapo dude
Posts: 3048
Joined: Sat Mar 23, 2002 12:41 pm
Location: Madrid, Spain

Just in case your BIOS gets "wiped" :wink:
...there's your same BIOS release available for downloading here:
Absentee administrator
Posts: 1086
Joined: Thu Mar 21, 2002 1:06 am
Location: Ontario, Canada

I thought only PcChips did fake cache...
Flash your BIOS at your own risk.
The Hardware Archivist
Posts: 6273
Joined: Wed Mar 20, 2002 7:11 pm
Location: Netherlands

4IP-UMC-AIO looks suspiciously like an ECS number, might be another relabeled PCChips. The ADI boards are among the cheapest worst pieces of s**t I encountered from that era so it figures...

Do not assume anything

System error, strike any user to continue...
Legacy means reliability
Posts: 113
Joined: Thu Mar 21, 2002 5:41 pm


So we have found two more siblings of the Syl8884/M921/ST1-A -> Syl...

My Bios chips are SST, but were also covered with black paint.
Give some real cache, they are really good boards.

IIRC The fake cache scandal did not only involve PCChips but also others like Chaintech etc.

286-16/NEAT Chipset/4 MB Mem/40 MB HDD/512kB Tridet/WfW
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