Biostar MB-8425UUD-A
chipChipset
cpuCPU socket
speedFSB speeds
20MHz25MHz33MHz40MHz50MHz
moboForm factor
Baby AT (max 220 x 330 mm)
dimDimensions
220mm x 220mm
chipCache
128KB256KB512KB
ramMax RAM size
128MB
ramRAM types
72-pin FPM72-pin EDO
pwrPSU connector
connI/O ports
1x 
AT Keyboard
1x 
Floppy interface
2x 
IDE interface
1x 
PS/2 mouse
1x 
Parallel
2x 
Serial
cardExpansion slots
4x 
16-bit ISA
3x 
32-bit PCI

Also known as:

  • Biostar MB-8433UUD-A
  • Biostar MB-8440UUD-A
  • Biostar MB-84xxUUD-A

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.

  • EDO RAM not correctly supported

The motherboard may experience difficulties in accurately recognizing or utilizing EDO RAM modules.

Last updated 2023-11-18T13:19:01Z
Score is 9.4/10
4 files available

Vendor: Award [4 entries]

POST string
Note
Core Ver.
BIOS Ver.
Last edit
POST string
05/20/96-UMC-881E/886B-2A4X5B08C-00
Note
Core version
4.51PG
BIOS version
Last edit
pwr 2022-01-13
POST string
12/05/95-UMC-881E/886B-2A4X5B08C-00
Note
Core version
4.50PG
BIOS version
Last edit
pwr 2023-11-18
POST string
12/05/95-UMC-881E/886B-2A4X5B08C-00
Note
Core version
4.51PG
BIOS version
Last edit
pwr 2022-01-13
POST string
11/07/95-UMC-881E/886B-2A4X5B08C-00
Note
Core version
4.50PG
BIOS version
Last edit
pwr 2021-02-05
drv 1 recommended driver available
Name
Version
OS support
Size
Filename
Name
Version
3.3
OS support
1981msdos MS-DOS 5.0 1987os2 OS/2 Warp 3.0 1993win Windows 3.1 1995win Windows 95
Size
unknown
Filename
doc 2 board documents available
Language
Release date
File
Last edit
Language
English
Release date
File
Last edit
pwr 1970-01-01
Language
English
Release date
File
Last edit
pwr 2023-11-18
chipdoc 1 chip document available
Chip
Language
Release date
File
Last edit
Chip
Language
English
Release date
File
Last edit
pwr 2023-10-14

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