Biostar MB-8425UUD-A

Also known as: Biostar MB-8433UUD-A Biostar MB-8440UUD-A Biostar MB-84xxUUD-A

Description

Chips

Downloads

CPUs

Chipset

UMC UM82C881 (UM8881 HB4 Super Energy Star Green w/IDE)

CPU socket

Socket 3 (PGA237)

CPU platforms

486486 (DX4)

FSB speeds

20MHz25MHz33MHz40MHz50MHz

Cache

128KB256KB512KB

RAM type

72-pin FPM

Max RAM size

128MB

PSU connector

AT-Style (P8-P9)

Form factor

Baby-AT (max 220 x 330mm)

Dimensions

220mm x 220mm

I/O ports

Floppy interface

IDE interface

PS/2 mouse

Parallel

Serial

Expansion slots

32-bit PCI

16-bit ISA

Known issues:

DALLAS RTC may be flat.

The RTC chip contains a battery which is probably empty by now. This battery holds the CMOS settings. If your board doesn't save the CMOS settings, replace the RTC chip with an equivalent, or mod the existing chip. Replacements can be made following this https://github.com/necroware/nwX287 or this https://github.com/necroware/nw12887 depending on the actual chip used.

Last updated 2022-01-13T08:14:37Z

TRW ID: 1075

Chipset

UMC UM82C881 (UM8881 HB4 Super Energy Star Green w/IDE)

Chipset parts

UMC UM8881 UMC UM8886A/B

Drivers: 2 entries

Language

Media type

OS Compatibility

Name

Version

MS-DOS 5.0 1987os2

OS/2 Warp 3.0 1993win

Windows 3.1 1995win

Windows 95

UMC PCI-IDE Device Drivers for UM8886B-N

3.3

MS-DOS 6.22 1987os2

OS/2 2.0

Windows 3.11 1995win

Windows 95 1995win

Windows NT 3.51

UMC 8886B IDE drivers

3.2

BIOS images: 3 files

Manuf.

POST String

Note

Core Ver.

BIOS Ver.

Award

05/20/96-UMC-881E/886B-2A4X5B08C-00

4.51PG

UUD960520S

Award

12/05/95-UMC-881E/886B-2A4X5B08C-00

4.51PG

UUD951222S.

Award

11/07/95-UMC-881E/886B-2A4X5B08C-00

4.50PG

UUD951108A.

Documentation: 1 entry

MTL Jumper manual (English)

Other files: not available

Model

Speed

FSB

Voltages

L1 Cache

L2 Cache

L3 Cache

Core

Process

TDP

AMD Am486 DX-40

40MHz

8KB

AMD Am486 DX4-100

100MHz

33MHz

3.3V

16KB

350nm

AMD Am486 DX4-100

100MHz

33MHz

3.3V

8KB

500nm

AMD Am486 DX4-100

100MHz

33MHz

3.3V

8KB

500nm

AMD Am486 DX4-75

75MHz

25MHz

3.3V

8KB

500nm

Cyrix Cx486 DX-50

50MHz

8KB

Cyrix Cx486 DX2-66

66MHz

33MHz

8KB

Cyrix Cx486 DX-33

33MHz

8KB

Cyrix Cx486 DX2-50

50MHz

25MHz

8KB

Cyrix Cx486 DX4 100

100MHz

33MHz

3.45V

8KB

Cyrix 5x86-100

100MHz

33MHz

3.45V

16KB

M1sc

650nm

Cyrix Cx486 DX2-v66

66MHz

33MHz

3.45V

8KB

Cyrix Cx486 DX-v33

33MHz

3.3V

8KB

Cyrix Cx486 DX4 100

75MHz

25MHz

3.45V

8KB

Cyrix Cx486 DX2-v50

50MHz

25MHz

3.45V

8KB

Intel i486 DX 50

50MHz

8KB

1000nm

Intel OverDrive 486SX2-66 (PGA169)

66MHz

33MHz

8KB

P23T

Intel OverDrive 486DX2-66 (PGA168)

66MHz

33MHz

8KB

P4T

Intel OverDrive 486DX2-66 (PGA169)

66MHz

33MHz

8KB

P4T

Intel i486 DX2 66

66MHz

33MHz

8KB

P24

800nm

Intel i486 DX2 66 (WB)

66MHz

33MHz

8KB

P24D

800nm

Intel i486 DX 33

33MHz

8KB

1000nm

Intel OverDrive 486DX2-50 (PGA168)

50MHz

25MHz

8KB

P4T

Intel OverDrive 486DX2-50 (PGA169)

50MHz

25MHz

8KB

P4T

Intel OverDrive 486SX2-50 (PGA169)

50MHz

25MHz

8KB

P23T

Intel i486 DX2 50

50MHz

25MHz

8KB

P24

800nm

Intel i486 DX2 50 (WB)

50MHz

25MHz

8KB

P24D

800nm

Intel i486 DX 25

25MHz

8KB

1000nm

Intel OverDrive 486SX2-40 (PGA168)

40MHz

20MHz

8KB

P23T

Intel i486 DX4 100

100MHz

33MHz

3.3V

16KB

P24C

600nm

Intel i486 DX4 75

75MHz

25MHz

3.3V

16KB

P24C

600nm

No NPUs listed.

Image 1 of 2 (Microhouse)

Image 2 of 2 (pshipkov)

Disclaimer

The info found in this page might not be entirely correct. Check out this guide to learn how you can improve it.