Chaintech 4UPB
chipChipset
cpuCPU socket
Socket 3 (PGA237)
speedFSB speeds
20MHz25MHz33MHz40MHz50MHz
moboForm factor
Baby AT (max 220 x 330 mm)
dimDimensions
Unknown
chipCache
None/Integrated in the CPU
ramMax RAM size
128MB
ramRAM types
30-pin SIMM72-pin FPM72-pin EDO
pwrPSU connector
AT (P8-P9)
connI/O ports
1x 
AT Keyboard
cardExpansion slots
4x 
16-bit ISA
3x 
32-bit PCI
2x 
32-bit VLB
1x 
8-bit ISA

Also known as:

  • Mylex MGV486
  • Chaintech 486UPB P103

Known issues:

  • DALLAS RTC coin cell empty

The motherboard's Real-Time Clock (RTC) chip contains a coin cell that may have drained, causing the loss of CMOS settings. This can result in an inability to save settings, causing system instability or failure to boot. To fix this, the RTC chip can be replaced with an equivalent or repaired by cutting into it and soldering on a new external coin cell holder. Replacement guides are available at https://github.com/necroware/nwX287 or https://github.com/necroware/nw12887, depending on the actual chip used.

Last updated 2023-10-14T18:05:07Z
Score is 9.1/10
chipsetChipset
chipChipset parts
UMC UM8881 UMC UM8886F
chipReal-Time Clock chips
Dallas DS12887
cpuCPU family support
1 file available

Vendor: Award [1 entry]

POST string
Note
Core Ver.
BIOS Ver.
Last edit
POST string
07/25/94-UMC-881/886-2A4X5C31-00
Note
Core version
4.50G
BIOS version
Last edit
pwr 2022-01-10
drv No drivers available
doc 2 board documents available
Language
Release date
File
Last edit
Language
English
Release date
File
Last edit
pwr 2021-04-24
Language
English
Release date
File
Last edit
pwr 2022-01-10
chipdoc 3 chip documents available
Chip
Language
Release date
File
Last edit
Chip
Language
English
Release date
File
Last edit
pwr 2023-06-02
Chip
Language
English
Release date
File
Last edit
pwr 2023-06-03
Chip
Language
English
Release date
File
Last edit
pwr 2023-10-14

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